计算 1/x-2 +1/x+2+2/x^2+4+4x/x^3x^2+16
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计算 1/x-2 +1/x+2+2/x^2+4+4x/x^3x^2+16
计算 1/x-2 +1/x+2+2/x^2+4+4x/x^3x^2+16
计算 1/x-2 +1/x+2+2/x^2+4+4x/x^3x^2+16
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