能简便算就简便计算.就1题 (7/8×7/12+7/8÷12/5)×2/3 = =

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能简便算就简便计算.就1题 (7/8×7/12+7/8÷12/5)×2/3 = =
能简便算就简便计算.就1题 (7/8×7/12+7/8÷12/5)×2/3 = =

能简便算就简便计算.就1题 (7/8×7/12+7/8÷12/5)×2/3 = =
(7/8×7/12+7/8÷12/5)×2/3
=(7/8×7/12+7/8×5/12)×2/3
=7/8×(7/12+5/12)×2/3
=7/8×2/3
=7/12

(7/8×7/12+7/8÷12/5)×2/3
= (7/8×7/12+7/8×5/12)×2/3
=7/8×(7/12+5/12)×2/3
=7/8×1×2/3
=7/12