1.（x^2-3x+2/x^2-5x+6)/(x^2-5x+4/x^2-7x+12)2.(x^2-6x+9)/(x^2-9x+18/x+3)

Question

1.（x^2-3x+2/x^2-5x+6)/(x^2-5x+4/x^2-7x+12)
2.(x^2-6x+9)/(x^2-9x+18/x+3)

Answer 1

{(X-1)*(X-2)/(X-2)*(X-3)}/{(X-1)*(X-4)/(X-3)*(X-4)
={(X-1)/(X-3)}/{(X-1)/(X-3)}
=1
{(X-3)*(X-3)}/{(X*X-9X+18)/(X+3)}
={(X-3)*(X-3)}/{(X-3)*(X-6)/(X+3)
=(X*X-6X)/(X-6)
=X(X-6)/(x-6)
=X
兄弟你那要格式写得真有点难看懂哎!呵呵