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数学
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1.(-8)+10+2+(-1) 2.5+(-6)+3+9+(-4)+(-7) 3.(-8)+1.2+(-0.7)+(2.1)+0.8+3.5 把过程写下来
4.1/2+(-2/3)+4/5+(-1/2)+(-1/3)
人气:240 ℃ 时间:2020-05-09 16:30:08
解答
1、(-8)+10+2+(-1)=10+2-8-1=3
2、5+(-6)+3+9+(-4)+(-7)=5+3+9-6-4-7=0
3、(-8)+1.2+(-0.7)+(2.1)+0.8+3.5 =1.2+2.1+0.8+3.5-(8+0.7)=-1.1
4、1/2+(-2/3)+4/5+(-1/2)+(-1/3)
=1/2+(-1/2)+(-2/3)+(-1/3)+4/5
=0+(-1)+4/5
=-1/5
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