Ex:3.5+(-2)-(-7.7)+0.9=? Ex:[1.3-(-2.5)+(-7)-0.5]=? 求答案?

2017-12-28 12:16 pm

回答 (1)

2017-12-28 1:42 pm
✔ 最佳答案
Ex:3.5+(-2)-(-7.7)+0.9
=3.5-2+7.7+0.9
=1.5+7.7+0.9
=9.2+0.9
=10.1
Ex:1.3-(-2.5)+(-7)-0.5
=1.3+2.5-7-0.5
=3.8-7-0.5
=-3.2-0.5
=-3.7


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