2.02乘8.5的简便方法快啊,今天3点半以前
问题描述:
2.02乘8.5的简便方法快啊,今天3点半以前
答
2.02*8.5
=(2+0.02)*8.5
=2*8.5+0.02*8.5
=2*8.5+0.02*(8+5)
=2*8.5+0.02*8+0.02*0.5
=17+0.16+0.01
=17.17
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