[1÷(4.1-4.09)]x 0.49+0.51
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
[1-x+(x-1/x)]÷[1-(1/x+1)]
x-2/x-1÷(x+1-3/x-1)
x²-1/x²-2x+1÷x+1/x-1 X 1-x/1+x
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
化简 (3x/x-1 -x/x+1)÷x/x²-1
1.(1+2/X-X+1/X-2)÷X+4/X²-2X
x^2-x/x+1÷x/x+1 ;x^2+6x+9/x^2-9÷x+2/x-3;2/a÷4/a
计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1
x-1/x²+x÷x²-2x+1/x²-1-1/x 等于多少