七年级简便运算要答案和过程

2021-11-03 社会 135阅读
1、|-0.25|-[+(-5.75)]+|0.1|-|-(+0.5)|
=0.25+5.75+0.1+0.5
=6.6
2、1又3/4-2又1/6-1.75+3又2/3
=7/4-13/6-7/4+22/6
=3/2
3、3又1/4+(-2又3/5)+(-5又3/4)+(-8又2/5)
=13/4-13/5-23/4-42/5
=-5/2-11
=-27/2
4、(-62.84)-(+38.57)+(37.16)-(-32.57)
=-62.84-38.57+37.16+32.57
=-25.68-6
=-31.68
5、|-7.2-(-6.4)|+(-0.4-|0.4|)
=0.8-0.8
=0
6、-3又1/2-[(-1又5/6)-|-1/6|]
=-7/2-[-11/6-1/6]
=-7/2+2
=-3/2
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