计算:1/(x^2-13x+42)+1/(x^2-15x+56)+1/(x^2-17x+72)
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计算:1/(x^2-13x+42)+1/(x^2-15x+56)+1/(x^2-17x+72)
计算:1/(x^2-13x+42)+1/(x^2-15x+56)+1/(x^2-17x+72)
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