15分之7乘以31+37乘以15分之9加15分之7乘以7,怎么简便计算？
2个回答
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7/15*31+37*9/15+7/15*7
=7/15*(3/37+1)+37*9/15
=7/15*38+37*9/15
=7/15*(1+37)+37*9/15
=37/15*7+7/15+9*37/15
=37/15*(7+9)+7/15
=37/15*16+7/15
=30/15*16+7/15*16+7/15
=32+7/15*16
=32+7+7/15
=39又7/15
=7/15*(3/37+1)+37*9/15
=7/15*38+37*9/15
=7/15*(1+37)+37*9/15
=37/15*7+7/15+9*37/15
=37/15*(7+9)+7/15
=37/15*16+7/15
=30/15*16+7/15*16+7/15
=32+7/15*16
=32+7+7/15
=39又7/15
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展开全部
7/15*31+37*9/15+7/15*7
=7/15*(3/37+1)+37*9/15
=7/15*38+37*9/15
=7/15*(1+37)+37*9/15
=37/15*7+7/15+9*37/15
=37/15*(7+9)+7/15
=37/15*16+7/15
=30/15*16+7/15*16+7/15
=32+7/15*16
=32+7+7/15
=39又7/15
=7/15*(3/37+1)+37*9/15
=7/15*38+37*9/15
=7/15*(1+37)+37*9/15
=37/15*7+7/15+9*37/15
=37/15*(7+9)+7/15
=37/15*16+7/15
=30/15*16+7/15*16+7/15
=32+7/15*16
=32+7+7/15
=39又7/15
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