作业帮17/25*5/37+18/25*17/37+17/37*2/25简算
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17/25*5/37+18/25*17/37+17/37*2/25简算
17/25*5/37+18/25*17/37+17/37*2/25简算
17/25*5/37+18/25*17/37+17/37*2/25简算
17/25*5/37+18/25*17/37+17/37*2/25
=17/25*5/37+17/25*18/37+17/25*2/37
=17/25*（5/37+18/37+2/37）
=17/25*25/37
=17/37
17*(5+18+2)/25*37=17/37