1、此文档仅供收集于网络,如有侵权请联系网站删除有理数加减混合运算习题(一)1将下列各式写成省略加号的和的形式,并合理交换加数的位置。(1)(+16)+(-29)-(+11)+(+9)= ;(2)(-3.1)-(-4.5) + (+4.4) - (+103) + (-2.5) = ;(3)(+)-5+(-)-(+)+(-)= ;(4)(-2.6)-(4.7)-(+0.5)+(+2.4)+(-3.2)= ;2计算:(1)59+3 (2)1017+8 (3)34+1911 (4)8+121623 (3) 34+1911 (4)8+121623 (5)(+3.41)(0.59) (6) (7)9+(3)
2、+3 (8)-4.2+5.7-8.4+10 (9)6.1-3.7-4.9+1.8 (12)(36)(25)(+36)+(+72) (13)(8)(3)+(+5)(+9) (14)(8)(3)+(+5)(+9) (15)(16) ; (17)4.7(8.9)7.5+(6)(18)(0.6)+1.7+(+0.6 )+(1.7 )+(9 ) (19) (20) (21) 1.8-(-1.2+2.1)-0.2-(-1.5)(22) (23) (24) (-)+(+0.25)+(-)-(+) (25) (+3)+(+4)-(+1)+(-3)(26)10-(-8)+(-3)-(-5) (27)-(-)-(
3、-)+(-) (28)- -+- (29) -0.8-(-0.08)-(-0.8)-(-0.92)-(-9) (30) (-2.5)+(+)+(-)+(+1) (31)- -0.25+-(-0.125)+ -0.75 (32)(-)+(-)(-)+ (33)-3+(-1)-2+(34)-9+(-13)-8-(-7)-(+) (35)-5-(+9)-(-17)+(-3)(36)-4-6-(-2)-(-0.8)-2 (37)(-121.4)+(-78.5)-(-8)-(-121.4)(38)-(-1)+(-)+2-(-)-(+4) (39)-5-(+9)-(-17)+(-3) 11阅读第(1)小题的计算方法,再计算第(2)小题 (1)计算:-5-(+9)-(-17)+(-3) =-5+(-9)+(+17)+(-3) =(-5)+(-9)+17+(-3)+(-)+(-)+(-) =0+(-1)=-1 上面这种方法叫做拆项法 (2)计算:(-2000)+(-1999)+4000+(-1) 1、 (选作题:15分)阅读观察下列解题过程:例:计算解:因为 所以=计算:只供学习与交流