简便计算70乘38加3乘620
2个回答
2016-09-26
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简便计算70乘38加3乘620
=70x38+30x62
=40x38+30x(38+62)
=40x40-40x2+30x100
=1600+3000-80
=4600-80
=4520
=70x38+30x62
=40x38+30x(38+62)
=40x40-40x2+30x100
=1600+3000-80
=4600-80
=4520
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