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[6又3/5 -(8.5-1/3)÷3.5]×(2又5/18+11/12) = [33/5 -(17/2-1/3)×2/7]×(41/18+11/12) = [33/5 -49/6×2/7]×115/36 = [33/5-7/3]×115/36 = 64/15×115/36 = 736/39
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