简便运算
3.14×11/8 +0.314×25/4 -31.4×0.2
=3.14×11/8 +3.14×5/8 -3.14×2
=3.14×（11/8+5/8-2）
=3.14×0
=0
简便运算 3.14×11/8 +0.314×25/4 -31.4×0.2
1个回答
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