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小数四则混合运算专项练习题有答案.doc

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小数混合运算专项练习276题(有答案) 第 41 页 (1) 0.11×1.8+8.2×0.11   (2) 2.34×99+2.34    (3) 5.4÷2.7×0.8 (4) 132×101 (5) 6.25÷1.25÷0.8 (6) 2.5×16. (7) 6.33×101﹣6.33 (8) 1.56×1.7+0.44×1.7 (9) 1.8×[(3.41﹣2.9)÷0.03] (10) 0.125×32×2.5. (11) 1.258×18.5﹣0.258×18.5 (12) 8.48÷0.8×0.9 (13) 1.25×2.4 (14) 5.85÷(1.3+0.5)×6. (15) 17.17﹣6.8﹣3.2﹣6.17 (16) 5.4×[(1.3+2.15)÷0.2] (17) 8.4÷0.6+8.4÷0.4 (18) 16.8×10.1 (19) 10.9﹣0.9÷0.2+1.8 (20) 1.25×3.2×0.25. (21) 1.36+4.85+2.64+6.15 (22) 98.5÷2.5÷4 (23) 5.4÷[2.5×(3.7﹣2.9)] (24) 0.8×(4﹣3.68)÷0.01 (25) 83.7﹣12.83﹣0.17 (26) 5.96+13×(3.2﹣3.12) (27) 4.32÷2.4×1.7; (28) 16.2×4.5+3.8×4.5; (29) 9.05﹣3.86﹣3.14; (30) 7.28+0.72÷0.9 (31) 4.32+5.43+6.68 (32) 17.17﹣6.8﹣3.2 (33) 5.29×9+5.29 (34) 16.8×10.1 (35) 2.74×9.5+5×0.274 (36) 0.36+9.6÷3.2. (37) 3.75×25+6.25×25 (38) 25.46﹣8.23﹣1.76 (39) 2.9+7.1×10 (40) 1.25×32×0.25. (41) 15.68﹣(7.78﹣4.32)﹣2.32 (42) 0.25×3.2×1.25 (43) 9.99×1.01 (44) 4.63×1.4+46.3×0.86 (45) 17.5÷0.8÷12.5 (46) 0.9+9.9+99.9+999.9. (47) 2.9×99+2.9 (48) 25×11.2×4 (49) 23.25﹣6.75﹣3.25. (50) 125×3.2×2.5 (51) 3.6×10.1 (52) 5.8×2.7+0.58×73 (53) 3.6+6.4×1.8 (54) (1.48+3.02)÷(3.6×0.5) (55) (36.7﹣4.9)×101﹣31.8.  (56) 6.33×101﹣6.33 (57) 35.6﹣5×1.73 (58) 1.6×55.4﹣55.4×0.6 (59) 17.68÷5.2+2.7×1.5. (60) 1.08×0.8÷0.27 (61) 102×0.45 (62) 22.78÷1.25÷0.8 (63) 0.34×101﹣0.34. (64) 0.125×32×2.5 (65) 0.8×6.3﹣0.8×3.8 (66) 504÷3.2×2.08 (67) (20﹣0.8×9)×5.7 (68) 2.4×1.5+3.6÷1.5 (69) 7.38﹣5.14+3.62﹣2.86 (70) 0.12×1.8+8.2×0.12 (71) 5.4÷[0.51÷(1.2﹣1.03)] (72) [(8.1﹣5.6)×0.9﹣1.05]÷0.04. (73) 10.8﹣0.8÷(0.35+0.05) (74) 8×[1÷(2.3﹣2.25)] (75) 2.64×9.9+0.264   (76) 4.52+0.61+1.39+6.48 (77) 4.27﹣(1.96﹣1.73) (78) (294.4﹣19.2×6)÷(6+8) (79) 12.5×0.76×0.4×8×2.5. (80) 4.98+8.02×2.5 (81) 60.8﹣40.8÷2.5 (82) 0.8×69.6×12.5 (83) 4.98×99+4.9 (84) 6.48÷3.2÷2.5 (85) 1.2×7.6+7.6×6.8.  (86) (9.4﹣5.8)×2.07 (87) 12.54﹣4.56﹣3.44﹣1.54 (88) (9.36×5+9.36+9.36×2)×1.25 (89) 7.236÷0.18﹣14.3×0.02. (90) 9.6÷0.4×0.25 (91) 29.7÷(5.85÷0.65) (92) 7.4×9.9 (93) 3.84﹣2.7×0.64 (94) 8.68﹣8.68÷0.56×0.5 (95) 4.7×4.7+4.7+4.3×4.7.   (96) 2.72÷[(8.2﹣6.5)×0.5]; (97) 9.12+9.12×9﹣60.2; (98) 28.4÷0.4÷0.25; (99) 27.36﹣27.36÷7.6. (100) 3.25×0.45+6.75×0.45 (101) 31.5﹣24.5÷3.5 (102) 7.5×102 (103) 6.3+3.7×2.8. (104) 2.15+8.73+1.27+7.85 (105) 11.87﹣(8.2+1.87) (106) 5.42﹣3.87﹣1.13 (107) 4.38﹣1.56+0.62﹣0.44 (108) 0.4×270×2. (109) (40+1.25)×8 (110) (12.5﹣0.05)×8 (111) 2.6×8.5+8.5×7.4 (112) 9.9×6.9﹣6.9×3.9 (113) 5.6×99+5.6 (114) 2.5×(1.9+1.9+1.9+1.9) (115) 7.2÷1.25÷8.  (116) 52.4﹣(15+0.6)÷1.6 (117) 9.87×99+9.87 (118) 46.8÷0.9÷0.4 (119) 5.5×17.3+6.7×5.5. (120) 99×4.2+4.2 (121) 0.25×1.25×3.2 (122) 6.4×14+15×6.4+6.4 (123) (1.3+1.3×0.125×8)÷(80﹣77.4) (124) 4×(25+2.5+0.25)÷111 (125) 6.25÷〔(17.2﹣3.6×4.5)÷0.32〕  (126) 28.4×99+28.4 (127) 0.94×2.5﹣0.45 (128) 4×0.8×12.5×2.5 (129) 17.5÷0.25×17+13. (130) 10.1×87 (131) 2.3+3.19÷(22﹣19.8) (132) 1.25×7.2. (133) 9.1﹣1.2÷6﹣6.24 (134) 7.3+12.8﹣3.8×2.3 (135) (5.36+7.64)÷13×100 (136) 7.575÷[(5.63﹣1.88)×0.2]. (137) 7.5﹣(5.5+1.24) (138) 0.26+15.68+9.74+2.32 (139) 13.26+9.55﹣3.26 (140) 6.1+3.9﹣6.1+3.9. (141) 31.7÷0.63(保留2位小数) (142) 2.4×1.5+3.6÷1.5 (143) 0.32×0.25+0.08÷4 (144) (9.6+1.48÷3.7)÷8 (145) 5.8÷[4×(1.34﹣0.14)] (146) 5.4÷[0.51÷(1.2﹣1.03)]. (147) 21.35﹣3.25﹣16.75 (148) 33.02﹣(148.4﹣90.85)÷2.5 (149) 32×2.5×0.125 (150) 18.1+(3﹣0.299÷0.23)×1. (151) 67﹣(2.98+0.67) (152) 8×16﹣73.8×6 (153) (45+14)÷73+710. (154) 13.7×0.125×8 (155) 0.8×[13﹣(3.12+5.28)] (156) 102×0.56 (157) 1.53×1.7+0.47×1.7. (158) 5.18+0.73+0.82 (159) 0.75×1.8÷1.5 (160) 12.5×7.1×0.8 (161) 6.12×99+6.12 (162) 8.6÷0.86+8×0.35 (163) 5.6×(18.5﹣8.5÷0.5)  (164) 0.125×4.78×80 (165) 2.8×3.6+1.4×2.8 (166) (0.4+40)×2.5 (167) 78.7﹣17.7×3.6 (168) 18÷[0.3×(8﹣6.5)] (169) 12.7+12.5+0.5. (170) 91÷2.6÷0.05= (171) 6.3×3.7+6.3×6.3= (172) (3.7+1.7×0.4)÷2.5= (173) 7.28+3.2÷2.5= (174) 0.74+0.9×7.4= (175) 7.8÷0.125÷0.8= (176) 37.5÷[0.3×(1.34﹣0.84)] (177) (2.5+27.75÷1.5)×1.6. (178) 6.21﹣3.8+2.2 (179) 6.03+3.7+2.97 (180) 17.43﹣6.57﹣2.43 (181) 20.47﹣(1.47+6.8) (182) 13.26+4.71+3.47+5.29 (183) 22.74+8.68﹣13.74.  (184) 10÷0.2÷2.5 (185) 64×4.5+3.6×45 (186) 1.25×3.2×0.8 (187) 14.5×102 (188) 14.64+3.7×2.8 (189) 8.4÷0.21÷0.5. (190) 0.125×9×8×0.3 (191) 4.62÷5÷0.66 (192) 5.78×2.3+5.78+5.78×6.7 (193) 7.75×[20÷(3.24﹣3.04)]. (194) 1.25×0.5×8×0.2 (195) 0.97×9+0.97 (196) 5.4÷[3×﹙3.8﹣2.9﹚]. (197) 0.4×(3.2﹣0.8)÷0.15 (198) 5.7+1.9×0.2÷7.6 (199) 32.4×6.3+32.4×3.7 (200) 18.2﹣10.6×(0.9﹣0.75) (201) 0.25×3.85×40 (202) 1.46×3.5+3.5×4.54. (203) 7×12.5×0.8 (204) 4.7×3.6+4.7×6.4 (205) 1.45×[(2.8+4.4)÷2.4].  (206) 4.2×(6.18﹣3.03)+6.3 (207) 15.02﹣6.8﹣(1.02+1.2 ) (208) 0.6×[(5﹣0.68)÷1.2] (209) 2.7÷4+6.3×0.25 (210) (6.02+2.8 )÷0.4﹣2.05 (211) 3.08×3.5+6.2×3.08+3.08×0.3. (212) 2.3+3.91÷(22﹣19.7) (213) 21.6÷[64.8﹣(48.6﹣2.7×2)].  (214) 93.6×3.6+1.4×3.6 (215) 0.25×0.8×0.125×0.4 (216) 2.7×1.5﹣2.7 (217) 9.08+5.45+11.92+4.55 (218) 1.25×30×1.2×0.8. (219) 0.6+0.94﹣0.208 (220) 4.85×1.25×8 (221) (64﹣22.4÷1.4)×1.2 (222) 18.3﹣6.25﹣3.75 (223) 2.8×3.6+1.4×2.8 (224) 6.6÷〔14.5﹣(1.7+1.8)〕  (225) 0.25×9.87×4 (226) 36.7×2.1+10.8 (227) 8.45﹣0.45×0.1 (228) 0.73×102 (229) 7.8×5.6+2.3×4.4 (230) 76.3×27﹣76.3×17. (231) 7.05×23.7+7.05×76.3. (232) [(7.6﹣5.2)÷0.4+2.54]×32. (233) 17.68÷5.2+2.7×1.5 (234) 35.6﹣5×1.73 (235) (1.1﹣0.78)×(2.7﹣1.95)  (236) 1.3×0.75×4 (237) 1.08÷1.8×1.2 (238) 50.4×1.9﹣1.8 (239) 0.82×0.25+1.18×0.25. (240) 8.5×[(2.36+2.42)÷0.25] (241) 3.9÷[(1.3+0.6)×6﹣3.6] (242) 4.25×6.3+3.7×4.25 (243) 205×0.99 (244) 25.6﹣7.49﹣2.51 (245) [2.5﹣(6.8﹣4.9)]×0.8. (246) 102×4.5 (247) 3.4÷[(1.2+0.5)×5] (248) 8×(20﹣1.25) (249) 0.654+10.9×6.5 (250) 22.7×1.25×0.8 (251) 3.91×2.8+6.09×2.8. (252) 6.23+3.09= (253) 132.4﹣59.8= (254) 6.62×0.84= (255) 2.07÷0.023=  (256) [20.026﹣(8.6+9.7)×0.92]÷30.19. (257) 0.125×32×2.5 (258) 0.8×6.3﹣0.8×3.8 (259) 50.4÷3.2×2.08 (260) 204÷(3.4×0.5) (261) (43.26+2.34)÷7.5 (262) (20﹣0.8×9)×5.7. (263) 13.25﹣0.8+1.75﹣1.2; (264) 2.5×99+2.5; (265) 10.36+4.8﹣16.5÷5;  (266) 12.5×2.4. (267) 38.78﹣19.59+41.22﹣30.41 (268) 2.74×4.86+4.86×6.26+4.86 (269) 0.08×(12.5+2.5)×0.1 (270) 25.92+(10.1﹣14.5×0.2) (271) 0.487×12.5÷48.7 (272) (8.16+2.09)÷[(10.3﹣9.3)÷0.4]. (273) 1.56×1.7+0.44×1.7 (274) 12.5×(7.2﹣1.9)×0.8 (275) 0.25×2010+20.10×75 (276) 30.8÷[(6.34﹣4.59)×4]. 参考答案: (1)0.11×1.8+8.2×0.11, =0.11×(1.8+8.2), =0.11×10, =1.1; (2)2.34×99+2.34, =2.34×(99+1), =2.34×100, =234; (3)5.4÷2.7×0.8, =2×0.8, =1.6; (4)132×101, =132×(100+1), =132×100+132, =13332; (5)6.25÷1.25÷0.8, =6.25÷(1.25×0.8), =6.25÷1, =6.25; (6)2.5×16, =(2.5×4)×4, =40 (7)6.33×101﹣6.33, =6.33×(101﹣1), =6.33×100, =633; (8)1.56×1.7+0.44×1.7, =1.7×(1.56+0.44), =1.7×2, =3.4; (9)1.8×[(3.41﹣2.9)÷0.03], =1.8×[0.51÷0.03], =1.8×17, =30.6; (10)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10 (11)1.258×18.5﹣0.258×18.5, =18.5×(1.258﹣0.258), =18.5×1, =18.5; (12)8.48÷0.8×0.9, =10.6×0.9, =9.54; (13)1.25×2.4, =1.25×8×0.3, =10×0.3, =3; (14)5.85÷(1.3+0.5)×6, =5.85÷1.8×6, =3.25×6, =19.5 (15)17.17﹣6.8﹣3.2﹣6.17 =(17.17﹣6.17)﹣(6.8+3.2), =11﹣10, =1; (16)5.4×[(1.3+2.15)÷0.2] =5.4×[3.45÷0.2], =5.4×17.25, =93.15; (17)8.4÷0.6+8.4÷0.4 =14+21 =35; (18)16.8×10.1 =16.8×10+16.8×0.1, =168+1.68, =169.68; (19)10.9﹣0.9÷0.2+1.8 =10.9﹣4.5+1.8, =8.2; (20)1.25×3.2×0.25 =(1.25×0.8)×(4×0.25), =1×1, =1 (21)1.36+4.85+2.64+6.15, =(1.36+2.64)+(4.85+6.15), =4+11, =15; (22)98.5÷2.5÷4, =98.5÷(2.5×4), =98.5÷10, =9.85; (23)5.4÷[2.5×(3.7﹣2.9)], =5.4÷[2.5×0.8], =5.4÷2, =2.7; (24)0.8×(4﹣3.68)÷0.01, =0.8×0.32÷0.01, =0.256÷0.01, =25.6; (25)83.7﹣12.83﹣0.17, =83.7﹣(12.83+0.17), =83.7﹣13, =70.7; (26)5.96+13×(3.2﹣3.12), =5.96+13×0.08, =5.96+1.04, =7. (27)4.32÷2.4×1.7, =1.8×1.7, =3.06; (28)16.2×4.5+3.8×4.5, =(16.2+3.8)×4.5, =20×4.5, =90; (29)9.05﹣3.86﹣3.14, =9.05﹣(3.86+3.14), =9.05﹣7, =2.05; (30)7.28+0.72÷0.9, =7.28+0.8, =8.08 (31)4.32+5.43+6.68, =4.32+6.68+5.43, =11+5.43, =16.43; (32)17.17﹣6.8﹣3.2, =17.17﹣(6.8+3.2), =17.17﹣10, =7.17; (33)5.29×9+5.29, =5.29×(9+1), =5.29×10, =52.9; (34)16.8×10.1, =16.8×10+16.8×0.1, =168+1.68, =169.68; (35)2.74×9.5+5×0.274, =2.74×9.5+0.5×2.74, =2.74×(9.5+0.5), =2.74×10, =27.4; (36)0.36+9.6÷3.2, =0.36+3, =3.36 (37)3.75×25+6.25×25, =25×(3.75+6.25), =25×10, =250; (38)25.46﹣8.23﹣1.76, =25.46﹣(8.23+1.76), =25.46﹣9.99 =15.45; (39)2.9+7.1×10, =2.9+71, =73.9; (40)1.25×32×0.25 =(1.25×8)×(4×0.25), =10×1, =1. (41)15.68﹣(7.78﹣4.32)﹣2.32, =15.68﹣7.78+4.32﹣2.32, =(15.68+4.32)﹣(7.78+2.32), =20﹣10, =10; (42)0.25×3.2×1.25, =0.25×4×0.8×1.25, =(0.25×4)×(0.8×1.25), =1×1, =1; (43)9.99×1.01, =(10﹣0.01)×1.01, =10.1﹣0.0101, =10.0899; (44)4.63×1.4+46.3×0.86, =46.3×0.14+46.3×0.86, =46.3×(0.14+0.86), =46.3×1, =46.3; (45)17.5÷0.8÷12.5, =17.5÷(0.8×12.5), =17.5÷1, =17.5; (46)0.9+9.9+99.9+999.9, =1﹣0.1+10﹣0.1+100﹣0.1+1000﹣0.1, =(1+10+100+1000)﹣(0.1+0.1+0.1+0.1), =1111﹣0.4, =1110.6 (47)2.9×99+2.9 =(99+1)×2.9, =100×2.9, =290; (48)25×11.2×4 =25×4×11.2, =100×11.2, =1120; (49)23.25﹣6.75﹣3.25 =23.25﹣(6.75+3.25), =23.25﹣10, =13.25 (50)125×3.2×2.5, =125×8×0.4×2.5, =(125×8)×(0.4×2.5), =1000×1, =1000; (51)3.6×10.1, =3.6×(10+0.1), =3.6×10+3.6×0.1, =36+0.36, =36.36; (52)5.8×2.7+0.58×73, =5.8×2.7+5.8×7.3, =5.8×(2.7+7.3), =5.8×10, =58; (53)3.6+6.4×1.8, =3.6+11.52, =15.12; (54)(1.48+3.02)÷(3.6×0.5), =4.5÷1.8, =2.5; (55)(36.7﹣4.9)×101﹣31.8, =31.8×101﹣31.8, =31.8×(101﹣1), =31.8×100, =3180 (56)6.33×101﹣6.33 =6.33×(101﹣1), =6.33×100, =633; (57)35.6﹣5×1.73, =35.6﹣8.65, =26.95; (58)1.6×55.4﹣55.4×0.6, =55.4×(1.6﹣0.6), =55.4×1, =55.4; (59)17.68÷5.2+2.7×1.5, =3.4+4.05, =7.45 (60)1.08×0.8÷0.27 =1.08÷0.27×0.8, =4×0.8, =3.2; (61)102×0.45 =(100+2)×0.45, =100×0.45+2×0.45, =45+0.9, =45.9; (62)22.78÷1.25÷0.8 =22.78÷(1.25×0.8), =22.78÷1, =22.78; (63)0.34×101﹣0.34 =(101﹣1)×0.34, =100×0.34, =34 (64)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10; (65)0.8×6.3﹣0.8×3.8, =0.8×(6.3﹣3.8), =0.8×2.5, =2; (66)504÷3.2×2.08, =157.5×2.08, =327.6; (67)(20﹣0.8×9)×5.7, =(20﹣7.2)×5.7, =12.8×5.7, =72.96 (68)2.4×1.5+3.6÷1.5, =3.6+2.4, =6; (69)7.38﹣5.14+3.62﹣2.86, =(7.38+3.62)﹣(5.14+2.86), =11﹣8, =3; (70)0.12×1.8+8.2×0.12, =0.12×(1.8+8.2), =0.12×10, =1.2; (71)5.4÷[0.51÷(1.2﹣1.03)], =5.4÷[0.51÷0.17], =5.4÷3, =1.8; (72)[(8.1﹣5.6)×0.9﹣1.05]÷0.04, =[2.5×0.9﹣1.05]÷0.04, =[2.25﹣1.05]÷0.04, =1.2÷0.04, =30 (73)10.8﹣0.8÷(0.35+0.05), =10.8﹣0.8÷0.4, =10.8﹣2, =8.8; (74)8×[1÷(2.3﹣2.25)], =8×[1÷0.05], =8×20, =160; (75)2.64×9.9+0.264, =0.264×99+0.264, =0.264×(99+1), =0.264×100, =26.4; (76)4.52+0.61+1.39+6.48 =(4.52+6.48)+(0.61+1.39), =11+2, =13; (77)4.27﹣(1.96﹣1.73) =4.27﹣0.23, =4.04; (78)(294.4﹣19.2×6)÷(6+8) =(294.4﹣115.2)÷14, =179.2÷14, =12.8; (79)12.5×0.76×0.4×8×2.5 =(12.5×8)×(0.4×2.5)×0.76, =100×1×0.76, =76. (80)4.98+8.02×2.5, =4.98+20.25, =25.03; (81)60.8﹣40.8÷2.5, =60.8﹣16.32, =44.48; (82)0.8×69.6×12.5, =(0.8×12.5)×69.6, =10×69.6, =696; (83)4.98×99+4.9, =493.02+4.9, =497.92; (84)6.48÷3.2÷2.5, =6.48÷(3.2×2.5), =6.48÷8, =0.81; (85)1.2×7.6+7.6×6.8, =7.6×(1.2+6.8), =7.6×8, =60.8  (86)(9.4﹣5.8)×2.07, =3.6×2.07, =7.452; (87)12.54﹣4.56﹣3.44﹣1.54, =(12.54﹣1.54)﹣(4.56+3.44), =11﹣8, =3; (88)(9.36×5+9.36+9.36×2)×1.25, =9.36×(5+2+1)×1.25, =9.36×8×1.25, =9.36×(8×1.25), =93.6; (89)7.236÷0.18﹣14.3×0.02, =40.2﹣0.286, =39.914. (90)9.6÷0.4×0.25, =24×0.25, =6; (91)29.7÷(5.85÷0.65), =29.7÷9, =3.3; (92)7.4×9.9, =7.4×(10﹣0.1), =7.4×10﹣7.4×0.1, =74﹣0.74, =73.26; (93)3.84﹣2.7×0.64, =3.84﹣1.728, =2.112; (94)8.68﹣8.68÷0.56×0.5, =8.68﹣15.5×0.5, =8.68﹣7.75, =0.93; (95)4.7×4.7+4.7+4.3×4.7, =4.7×(4.7+4.3+1), =4.7×10, =47 (96)2.72÷[(8.2﹣6.5)×0.5] =2.72÷[1.7×0.5], =2.72÷0.85, =3.2; (97)9.12+9.12×9﹣60.2 =(1+9)×9.12﹣60.2, =10×9.12﹣60.2, =91.2﹣60.2, =31; (98)28.4÷0.4÷0.25 =28.4÷(0.4×0.25), =28.4÷0.1, =284; (99)27.36﹣27.36÷7.6 =27.6﹣3.6, =24 (100)3.25×0.45+6.75×0.45, =0.45×(3.25+6.75), =0.45×10, =4.5; (101)31.5﹣24.5÷3.5, =31.5﹣7, =24.5; (102)7.5×102, =7.5×(100+2), =7.5×100+7.5×2, =750+15, =765; (103)6.3+3.7×2.8, =6.3+10.36, =16.66. (104)2.15+8.73+1.27+7.85 =(2.15+7.85)+(8.73+1.27), =10+10, =20; (105)11.87﹣(8.2+1.87), =11.87﹣1.87﹣8.2, =10﹣8.2, =1.8; (106)5.42﹣3.87﹣1.13, =5.42﹣5, =0.42; (107)4.38﹣1.56+0.62﹣0.44, =(4.38+0.62)﹣(1.56+0.44), =5﹣2, =3; (108)0.4×270×2.5, =(0.4×2.5)×270, =270; (109)(40+1.25)×8, =40×8+1.25×8, =320+10, =330; (110)(12.5﹣0.05)×8, =12.5×8﹣0.05×8, =100﹣0.4, =99.6; (111)2.6×8.5+8.5×7.4, =(2.6+7.4)×8.5, =85; (112)9.9×6.9﹣6.9×3.9, =(9.9﹣3.9)×6.9, =6×6.9, =41.4; (113)5.6×99+5.6, =5.6×(99+1), =560; (114)2.5×(1.9+1.9+1.9+1.9), =2.5×4×1.9, =10×1.9, =19; (115)7.2÷1.25÷8, =7.2÷8÷1.25, =0.9÷1.25, =0.72. (116)52.4﹣(15+0.6)÷1.6, =52.4﹣15.6÷1.6, =52.4﹣9.75, =42.65; (117)9.87×99+9.87, =9.87×(99+1), =987; (118)46.8÷0.9÷0.4, =46.8÷(0.9×0.4), =46.8÷0.36, =130; (119)5.5×17.3+6.7×5.5, =5.5×(17.3+6.7), =5.5×24, =132 (120)99×4.2+4.2 =4.2×(99+1), =4.2×100, =420; (121)0.25×1.25×3.2 =0.25×1.25×(4×0.8), =0.25×4×(1.25×0.8), =1×1, =1; (122)6.4×14+15×6.4+6.4 =6.4×(14+15+1), =6.4×30, =192; (123)(1.3+1.3×0.125×8)÷(80﹣77.4) =(1.3+1.3×1)÷2.6, =2.6÷2.6, =1; (124)4×(25+2.5+0.25)÷111 =(4×25+4×2.5+4×0.25)÷111, =(100+10+1)÷111, =111÷111, =1; (125)6.25÷[(17.2﹣3.6×4.5)÷0.32] =6.25÷[(17.2﹣16.2)÷0.32], =6.25÷(1÷0.32), =6.25÷3.125, =2 (126)28.4×99+28.4, =28.4×(99+1), =28.4×100, =2840. (127)0.94×2.5﹣0.45, =2.35﹣0.45, =1.9. (128)4×0.8×12.5×2.5, =(4×2.5)×(0.8×12.5), =10×10, =100. (129)17.5÷0.25×17+13, =70×17+13, =1190+13, =1203 (130)10.1×87, =(10+0.1)×87, =87+8.7, =95.7; (131)2.3+3.19÷(22﹣19.8), =2.3+3.19÷2.2, =2.3+1.45, =3.75; (132)1.25×7.2, =1.25×8×0.9, =10×0.9, =9 (133)9.1﹣1.2÷6﹣6.24 =9.1﹣0.2﹣6.24, =8.9﹣6.24, =2.66; (134)7.3+12.8﹣3.8×2.3 =20.1﹣8.74, =11.36; (135)(5.36+7.64)÷13×100 =13÷13×100, =100; (136)7.575÷[(5.63﹣1.88)×0.2] =7.575÷[3.75×0.2], =7.575÷0.75, =10.1 (137)7.5﹣(5.5+1.24), =7.5﹣5.5﹣1.24, =2﹣1.24, =0.76; (138)0.26+15.68+9.74+2.32, =(0.26+9.74)+(15.68+2.32), =10+18, =28; (139)13.26+9.55﹣3.26, =13.26﹣3.26+9.55, =10+9.55, =19.55; (140)6.1+3.9﹣6.1+3.9, =6.1﹣6.1+(3.9+3.9), =0+7.8, =7.8 (141)31.7÷0.63≈50.32; (142)2.4×1.5+3.6÷1.5 =3.6+2.4, =6; (143)0.32×0.25+0.08÷4 =0.08+0.08÷4, =0.08+0.02, =0.08+0.02, =0.1; (144)(9.6+1.48÷3.7)÷8 =(9.6+0.4)÷8, =10÷8, =1.25;
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