（1）分解因式：①4a^2+4a-8②3x-12x^3 (2)解方程：(48x+36)(57x+39)-(57x+45)(48x+36)=0
问题描述：
（1）分解因式：①4a^2+4a-8②3x-12x^3 (2)解方程：(48x+36)(57x+39)-(57x+45)(48x+36)=0
答
1:4a²+4a-8=4(a²+a-2)=4(a-1)(a+2)
2:3x-12x³=3x(1-4x²)=3x(1+2x)(1-2x)
3:：(48x+36)(57x+39)-(57x+45)(48x+36)=0
(48x+36)(57x+39-57x-45)=0
(48x+36)(-6)=0
48x+36=0
x=-3/4