八分之三乘七分之三加七分之四乘八分之五
=1/8x9/7+1/8x20/7
=1/8x(9/7+20/7)
=1/8x29/7
=29/56
八分之三乘七分之三加七分之四乘八分之五简便计算
八分之三乘七分之三加七分之四乘八分之五简便计算
最迟17：50
最迟17：50
数学人气：595 ℃时间：2020-01-31 12:23:23
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