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计算1/5x6+1/6x7+1/7x8+1/8x9+...+1/47x48+1/48x49+1/

第一题:6x(8x2/9x2-1x9/2x9-1x3/6x3)=6x4/18=4/3 第二题:(21/24+4/24+16/24)*48=31/24*48=62

9*48+48=48*(9+1)=48*10=480

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