计算:x+2/x^2-2x-x-1/x^2-4x+4

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计算:x+2/x^2-2x-x-1/x^2-4x+4
计算:x+2/x^2-2x-x-1/x^2-4x+4

计算:x+2/x^2-2x-x-1/x^2-4x+4
x+2/x^2-2x-x-1/x^2-4x+4 过程
=（x+2）/x(x-2)-(x-1)/(x-2)²
=((x+2)(x-2)-(x-1)x)/x(x-2)²
=(x²-4-x²+x)/x(x-2)²
=(x-4)/x(x-2)²;
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原式=(x+2)/x(x-2)-(x-1)/(x-2)²
=[(x+2)(x-2)-x(x-1)]/x(x-2)²
=(x²-4-x²+x)/x(x-2)²
=(x-4)/(x³-4x²+4x)

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