有几道因式分解的题不会,麻烦给为看看,
问题描述：
有几道因式分解的题不会,麻烦给为看看,
1.2a²b(x+y)²(b+c)-6a³b²(x+y)(b+c)²
2.32ac²+15cx²-48ax²-10c³
3.3x³+7x²-4
答
1.2a²b(x+y)²(b+c)-6a³b²(x+y)(b+c)² =2*a^2*b*(x+y)*(b+c)[x+y-3ab(b+c)] =2a^2b(x+y)(b+c)[x+y-3ab^2-3abc] 2.32ac²+15cx²-48ax²-10c³ =(32ac^2-10c^3)+(15cx^2-48a...