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題目有問題,只好將錯就錯 2×5分之1+3×5分之1+8×11分之1+……+20×23分之1 =1/10+1/15+(1/8+1/11+1/11-1/14+……+1/20-1/23)/3 =1/6+(1/8-1/23)/3 =1/6+5/184 =107/552
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