15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12
=15.37x(7.88+2.12)-9.37x(7.88+2.12)
=15.37x10-9.37x10
=153.7-93.7
=60
15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12的简便计算
15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12的简便计算
数学人气:494 ℃时间:2020-04-17 20:49:23
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