初二下学期分解因式[数学]
1.xy(x-y)-x(x-y)²
2.-12xy+x²+36y²
3.a²-8ab+16ab
4.(a²+b²)²-4a²b²
5.2(a-1)²-12(a-1)+18
6.3x²+12xy+12y²