初一数学有理数的加减混合运算题目

2024-11-24 14:29:28
推荐回答(2个)
回答1:

0-1+2-3+4-5=2+4-1-3-5=6-9=-3

-4.2+5.7-8.4+10.2=10.2+5.7-(4.2+8.4)=15.9-12.6=3.3

-30-11-(-10)+(-12)+18=-30-11+10-12+18=10+18-(30+11+12)=28-53=-25

三又二分之一-(二又四分之一)+(-三分之一)-四分之-(+六分之一)
=3+1/2-2-1/4-1/3-1/4-1/6
=1+(1/2-1/4-1/4)-(1/3+1/6)
=1-1/2=1/2

(-7)-(-10)+(-8)-(+2)=-7+10-8-2=-7

1+(-1又二分之一)-(-二分之一)-(+四分之一)
=1-1-1/2+1/2-1/4
=-1/4

(+二分之一)+[(-2)+(+二分之一)]
=1/2-2+1/2
=-1
(-1.2)+[1-(-0.3)]=-1.2+1+0.3=0.1

13-[26-(-21)+(-18)]
=13-26+(-21)-(-18)
=13-26-21+18
=31-47=-16

[1.4-(-3.6+5.2)-4.3]-(-1.5)
=1.4+3.6-5.2-4.3+1.5
=6.5-9.5
=-3

|-二又四分之一|-(-四分之三)+1 - | 1 ﹣二分之一|
=2+1/4+3/4+1-1/2
=4-1/2
=3又1/2

回答2:

0-1+2-3+4-5=-1+2-3+4-5=+1-3+4-5=-2+4-5=+2-5=-3 -4.2+5.7-8.4+10.2=10.2-4.2+5.7-8.4=6+5.7-8.4=11.7-8.4=3.3 -30-11-(-10)+9+(-12)+18 =-30-11+10+9-12+18 =-25