(5/6-4/15)÷2/3 = = = …………

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(5/6-4/15)÷2/3 = = = …………

(5/6-4/15)÷2/3
=(25/30-8/30)÷20/30
=17/30÷20/30
=17÷20
=0.85

17/20

答案是减1=多少。自己算