因式分解4-12x+12Y+9(X-Y)(X-Y)

问题描述:

因式分解4-12x+12Y+9(X-Y)(X-Y)

4-12x+12Y+9(X-Y)(X-Y)=3(X-Y)*3(X-Y)-2*3*2(X-Y)+4=
{3(X-Y)-2}*{3(X-Y)-2}=(3X-3Y-2)*(3X-3Y-2)
平方不会用··
汗····