3.14×4.3+31.4×72%-0.314×15简便计算
6个回答
3.14×4.3+31.4×72%-0.314×15
=3.14×4.3+3.14×7.2-3.14×1.5
=3.14x(4.3+7.2-1.5)
=3.14x10
=31.4
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