数学竞赛辅导试题,有理数的运算与参设(1/31+1/37+1/41+1/47+1/53+1/69)*(1/29+1/31+1/37+1/41+1/47+1/53)-(1/29+1/31+1/37+1/41+1/47+1/53+1/63)+(1/31+1/37+1/41+1/47+1/53)为了竞赛专门训练的。最好不要用那种大
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