Question

x的平方-6x+9/9-x的平方÷2x-6/x的平方+3x

Answer 1

x的平方-6x+9/9-x的平方÷2x-6/x的平方+3x

{(x-3)²/[(3-x)(3+x)]}÷{2(x-3)/[x(x+3)]}

=[(3-x)/(3+x)]÷{2(x-3)/[x(x+3)]}

=[(3-x)x(x+3)]/[2(x-3)(3+x)]

=-x/2