3x^2-xy/9x^2-6xy+y^2,其中x=-8,y=2.

问题描述:

3x^2-xy/9x^2-6xy+y^2,其中x=-8,y=2.

(3x²-xy)/(9x²-6xy+y²)
=x(3x-y)/(3x-y)²
=x/(3x-y)
=-8/(-24-2)
=4/13