Question

（x的平方-2x分之1 - x的平方-4x+4分之1)除以2/x的平方-2x x=3

Answer 1

原式=[1/x(x-2)-1/(x-2)²]*x²/2

=[(x-2-x)/x(x-2²]*x²/2

=-2/x(x-2)²*x²/2

=-x/(x-2)

=-3/(3-2)

=-3