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计算题专项练习
一、计算下面各题,怎样简便就怎样算。
(1)1.65÷5+1.29×0.2+×20% (2)(+)×3+ (3)24×(-)÷
(4) 4.85×0.17+0.485×8.3 (5)×[-(-)] (6)+×99+
(7) 2008× (8) 2-2.86×(6.25-6) (9)4÷1+6×
(10)(0.86+0.86+0.86+0.86)×25 (11)125÷(50÷8) (12)(70+)×
(13)7.6×÷[1.9-1.9×(1.9-1.9)] (14)9999×7+1111×37 (15)2007×
(16)1-1÷2-1÷3- (17) 231÷231 (18)19.98×37-199.8×1.9+1998×0.82
(19) 8.89×36+8.89×63+8.89 (20) 216×( - (21)
(22) (23)(15+25)×2 (24) 3700-2185-815 (25)12×25
(26) 28×25 (27)125×(8+4) (28)32+144+68+56(29)2847-14×4×25×1
(30) 60×(15+500) (31) 435+1999 (32)8×(125+9) (33)46×18+54×18
(34)(400+16)×5 (35)170×4+80×4 (38)103×56 (37)13×68+13×32
(38)(2+4)×15 (39)5×(20+6) (40)8×23+8×27 (41)9×6+4×9
(42)99×14 (43)75×99+75 (44)102×36 (45)49×80+80 (46)430-216-184(47)67×9+33×9 (48)(13×8)×125 (49)20×(17×5) (50)14×20×5
(51) 276×38+276×62 (52) 102×26 (53)25×(40×32) (54)(5×7)×80
(55) 8×14×125×6 (56)16×25×5×4 (57)25×13×4 (58)2843-598
(59) 4×8×25×125 (60)259+468+741+532 (61)36×25 (62)12×15+12×35
(63)31×128-28×31 (64)(25+250)×4 (65)(125×125)×8 (66)(- )×60
(67) ×+× (68)25×8 (69) ×(15×)× (70)×101-
(71) ×÷× (72) × 99 + (73)( + )× (74) ×+ ×-
(75) 3×25 (76)36× (77)( - )×
二、怎样简便就怎样算。(所有计算过程请用草稿本写清楚。)
(1)3-- (2)×+× (3)×+÷ (4)18×(+)
(5)×7+×5 (6)(-)×(24-) (7)(×+)÷ (8)÷[(+)×]
(9)×7+×5 (10)(-)×24-) (11)(×+)÷ (12)÷[(+)×]
(13)() (14) (15) (16) ×+×+
(17)(32×+17)÷ (18)(25+)÷+ (21)(21×+×21)× (22)(99+)÷9
(19 ) (20)
(23)×÷ (24)÷[(+)×] (25)(+)×30 (26)+3÷
(27) ×-÷ (28) 4-- (29)×+÷ (30)×58+×41+
(31)××- (32)÷[(-)÷] (33)235 - 135÷18 (34)10 - - +
(35)(+)÷+ (36 )25×÷× (37) 13.09-8.12-4.88 (38) 12×103-4500÷75
(39)×[÷(×)] (40)(+)×15×11 (41)16×25×5×4 (42)4×8×25×125
(43)36×25 (44)36× (45) ×+× (46) ×101-
(47) ×÷× (58) × 99 + (49)( + )× (50) ×+ ×-
三、求未知数。
112.6+ X=277.9 X +193 =978 X÷2.7=7 X÷22.2=2 X-123=456 X-12.3=4.56
5 X=6.5 14 X=1.12 1-= 4-7×1.3=9.9 4×(x-0.8)=8
:28%=:0.7 =: χ+χ-6= χ-0.8χ-6=16
=30% ∶χ=∶2 X+X=45 X:(2+5)=10.5:4 6(-3.5)=17.8+2 四、附加题:(简便方法计算)
(1)4.75-9.63+(8.25-1.37) (2)36×1.09+1.2×67.3
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