Question

化简（x方-2x分之x+2+x方-4x+4分之1-x）除以x分之x-4

Answer 1

原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(x-4)

=[(x²-4-x²+x)/x(x-2)²]×x/(x-4)

=[(x-4)/x(x-2)²]×x/(x-4)

=1/(x-2)²