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根據韋達定理: x1+x2=2……A x1*x2=3/2……B x2/x1+x1/x2=(x2平方+x1平方)/(x1*x2) 分母直接代入B式=3/2 分子=B+2x1*x2-2x1*x2=(x1+x2)平方-2x1*x2=4-3=1 所以結果=2/3
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