一些初一的计算题,给你答案让你写过程,麻烦各位高手指点.

2个回答

  • (1)22+(-3)+(-31)+9+(-5)答案为:-8 求过程

    =22-3-31+9-5

    =22+9-3-31-5

    =31-31-5-3

    =-5-3

    =-8

    (2)(+6)+(-12)+8.3+(-7.4)+(+9.1)+(-2.5)答案为:1.5求过程

    =6-12+8.3-7.4+9.1-2.5

    =-6+8.3+9.1-7.4-2.5

    =-6+17.4-7.4-2.5

    =-6+10-2.5

    =4-2.5

    =1.5

    (3)(-3/5)+(-1/2)+1/4+(-7/10)答案为:-31/20求过程

    =-3/5-1/2+1/4-7/10

    =-3/5-1/2-7/10+1/4

    =-6/10-5/10-7/10+1/4

    =-18/10+1/4

    =-9/5+1/4

    =-36/20+5/20

    =-31/20

    (4)(-8.25)+8.75+(-5又1/4)+(-9又1/2)答案为:-14.25求过程

    =-8.25+8.75-5.25-9.5

    =-8.25-5.25-9.5+8.75

    =-13.5-9.5+8.75

    =-23+8.75

    =-14.25

    (5)(-7.34)+(-12.74)+7.34+12.4答案为:-0.34求过程

    =-7.34-12.74+7.34+12.4

    =7.34-7.34-12.74+12.4

    =-12.74+12.4

    =-0.34

    (6)(-2又1/3)+(+3又1/2)+(-2又2/3)+6又1/2+(-5又3/4)答案为;-3/4求过程

    =(-2又1/3)+(+3又1/2)+(-2又2/3)+6又1/2+(-5又3/4)

    =-2-1/3+3+1/2-2-2/3+6+1/2-5-3/4

    =-2+3-2+6-5-1/3+1/2-2/3+1/2-3/4

    =6+3-2-2-5-1/3-2/3+1/2+1/2-3/4

    =-(1/3+2/3)+(1/2+1/2)-3/4

    =-1+1-3/4

    =-3/4

    (7)(-1)+(-2)+(-3)+(-4)+……+(-39)+(-40)

    =-1-2-3-4+……-39-40

    =(-1-40)*40/2

    =-820