1-（1/1-x）-（x²-2x+1/x²-1）=(x²-1)/(x²-1)+(x+1)/(x²-1)-(x-1)²/(x²-1)=(x²-1+x+1-x²-1+2x)/(x²-1)=(3x-1)/(x²-1);很高兴为您解答,skyhunter002为您答疑...