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37×1/4+18×0.25+45×25% =(37+18+45)x0.25 =100x0.25 =25 2/15÷1又1/4+80%×2/15 =2/15x(4/5+0.8) =2/15x4/5X2 =16/75 不理解就追問,理解了請採納!
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