因式分解,要睡觉啦
问题描述：
因式分解,要睡觉啦
①3ax²+6axy+3ay² ②a²（a-3）-a+3 ③（x²+y²）²-4x²y²
答
①3ax²+6axy+3ay² =3a（x+y）^2
②a²（a-3）-a+3 =(a-3)(a+1)(a-1)
③（x²+y²）²-4x²y²=(x+y)^2(x-y)^2求过程！①3ax²+6axy+3ay² =3a（x^2+2xy+y^2)=3a（x+y）^2
②a²（a-3）-a+3 =a²（a-3）-(a-3)=(a-3)(a^2-1)=(a-3)(a+1)(a-1)
③（x²+y²）²-4x²y²=（x²+y²）²-(2xy)^2=(x²+y²+2xy)(x²+y²-2xy)=(x+y)^2(x-y)^2