6.28x72十2.8x62.8简便运算怎样做把步骤写一下，我在教孩子做
匿名用户 2015-10-11 15:34
满意回答
=6.28x72+6.28x28 =6.28x（72+28）=6.28x100 =628
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6.28×72+2.8×62.9 =6.28×72+28×6.28 =(72+28)×6.28 =628 望采纳 谢谢
6.28x72十2.8x62.8 =6.28x72十28x6.28 =6.28×(72+28) =6.28×100 =628