化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)²
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化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)²
={(x+2)/x(x-2) - (x-1)/(x-2)²}*x/(x-1)(x-4) *(x-2)²
={(x+2)(x-2)/x - (x-1)}*x/(x-1)(x-4)
={(x^2-4-x(x-1))/x }*x/(x-1)(x-4)
={(x^2-4-x^2+x)/x }*x/(x-1)(x-4)
={(x-4)/x }*x/(x-1)(x-4)
=1/(x-1)
={(x+2)/x(x-2) - (x-1)/(x-2)²}*x/(x-1)(x-4) *(x-2)²
={(x+2)(x-2)/x - (x-1)}*x/(x-1)(x-4)
={(x^2-4-x(x-1))/x }*x/(x-1)(x-4)
={(x^2-4-x^2+x)/x }*x/(x-1)(x-4)
={(x-4)/x }*x/(x-1)(x-4)
=1/(x-1)
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