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0.72×125 3.7×67+37×3.3 这两道题怎么用简便方法计算?
人气:469 ℃ 时间:2020-01-27 09:05:27
解答
0.72×125
=0.9×(0.8×125)
=0.9×100
=90
3.7×67+37×3.3
=3.7×67+3.7×33
=3.7×(67+33)
=3.7×100
=370
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