15.37*7.88-9.37*7.88+15.37*2.12-9.37*2.12简算
1个回答
原式=15.37*(7.88+2.12)-9.37*(7.88+2.12)
=(15.37-9.37)*10
=6*10
=60
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15.37*7.88-9.37*7.88-15.37*2.12+9.37*2.12= *=乘号
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