同乘x(x-1)x平方+（x-1）=x(x-1) x平方+x-1=x平方-x 2x=1 x=0.5(即1/2)
x/(x-1)+1/x=1[x^2+x-1]/(x-1)x=1[x^2+x-1-x^2+x]/(x-1)x=0[2x-1]/(x-1)x=0x=1/2
x²/x-1=xx²+x-1=x²-x2x=1x=0.5
x1=1。x2=-2
