5/9×7又5/12+1/9×1又7/12×5简便
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5/9×7又5/12+1/9×1又7/12×5简便
5/9×7又5/12+1/9×1又7/12×5
简便
5/9×7又5/12+1/9×1又7/12×5简便
原式=5/9*7又5/12+5/9*1又7/12
=5/9*(7又5/12+1又7/12)
=5/9*9
=5
以后要会做哦
5/9×7又5/12+1/9×1又7/12×5
=5/9×7又5/12+5/9×1又7/12
=5/9×(7又5/12+1又7/12)
=5/9×9
=5