Question

化简：（x的平方-9）分之（x-2)（1+（x的平方-4x+4）分之（2x-7)）除（x+3）分之1

Answer 1

(x-2)/(x+3)(x-3)* (x²-2x-3)/(x-2)²* （x+3)

=1/(x-3)* (x²-2x-3)/(x-2)

=(x+1)/(x-2)