8道有理数加减混合运算的题目(要步骤)

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8道有理数加减混合运算的题目(要步骤)
8道有理数加减混合运算的题目(要步骤)

8道有理数加减混合运算的题目(要步骤)
(-2.5)+5 -(-1)
= 5-2.5+1 
=3.5
(+15)+(-20)-(+15)+7
=15-20-15+7
=-20+7
=-13
30-17.5+(-20)+(+17.5)
=30-20+(17.5-17.5)
=10
(-2.75)+(-17/4)-19/8+0.625
=-(2.75+4.25)-(2.375-0.625)
=-7-1.75
=-8.75
(-27)-(+14)+(-18)-(-30)-(-18)
=-27-14+(-18+18)+30
=-41+30
=-11
-8.5+7.3-5.3+4.25+5.5-3.25
=(5.5-8.5)+(7.3-5.3)+(4.25-3.25)
=-3+2+1
=-1+1
=0
-3.75+1.125-5/4+4.875-1
=-(15/4+5/4)+(1.125+4.875)-1
=-5+5-1
=-1
|-3|+|29.5|-|-12.5|+4
=3+29.5-12.5+4
=(29.5-12.5)+(3+4)
=17+7
=24
总共8题
加减混合运算应该包括绝对值吧