(5/6+5/8)x8/25 = = = =

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(5/6+5/8)x8/25 = = = =
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(5/6+5/8)x8/25 = = = =
(5/6+5/8)x8/25 = = = =

(5/6+5/8)x8/25 = = = =
(5/6+5/8)x8/25 = 7/15

原式=5*(1\6+1\8)*8\25=5*1\25*(8*1\6+8*1\8)=1\5*(4\3+1)=7\15