(5/6-2/3)*9/10简便算法怎么算,

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(5/6-2/3)*9/10简便算法怎么算,
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(5/6-2/3)*9/10简便算法怎么算,
(5/6-2/3)*9/10简便算法怎么算,

(5/6-2/3)*9/10简便算法怎么算,
(5/6-2/3)*9/10 (分配率)
=(5/6)*(9/10) - (2/3)*(9/10)
=(1/2)*(3/2) - (1)*(3/5)
=(3/4) - (3/5)
=3/20