3x^2-xy /9x^2-6xy+y^2=x/( )=( )/9x^2-y^2
问题描述：
3x^2-xy /9x^2-6xy+y^2=x/( )=( )/9x^2-y^2
答
数学题：3x^2-xy /9x^2-6xy+y^2=x/( 3x-y)=(3x^2+xy )/9x^2-y^2
9x^2-6xy+y^2=[3x-y]^2