Question

计算:(x+2/x²-2x)-(x-1/x²-4x+4)

Answer 1

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)/x(x-2)²