3.17+7.48-2.78+0.53-3.48-1.62+5.3

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3.17+7.48-2.78+0.53-3.48-1.62+5.3
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3.17+7.48-2.78+0.53-3.48-1.62+5.3
3.17+7.48-2.78+0.53-3.48-1.62+5.3

3.17+7.48-2.78+0.53-3.48-1.62+5.3
分组
3.17+7.48-2.78+0.53-3.48-1.62+5.3
=(3.17+0.53)+(7.48-3.48)-2.78-1.62+5.3
=3.7+4-2.78-1.62+5.3
=(3.7+5.3)+4-2.78-1.62
=9+4-2.78-1.62
=13-(2.78+1.62)
=13-4.4
=8+5-4.4
=8+0.6
=8.6

这也问,自己用计算一下就是了,在不会用计算器吗
8.6

8.6