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(5分之4减7分之1)加8分之3 =4/5-1/7+3/8 =(4×56-40+105)/280 =289/280 (21分之11加3分之1)减6分之1 =11/21+1/3-1/6 =11/21+1/6 =22/42+7/42 =29/42
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