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原式=(11/42)×(7/2)×(6/5) =(11×7×3)/(42×5) =11/10 原式=(2/3)÷5÷(5/18)×(3/8) =(2/3)×(1/5)×(18/5)×(3/8) =(18/25)×(1/4) =9/50
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