几道因式分解的题(初中)
问题描述:
几道因式分解的题(初中)
x²-xy-30y²=
x五次方-x³y²-12xy四次方=
7p²-5pq-2q²=
6x²-5xy-6y²=
30a²-ab-b²=
不好意思~还有个:
(ax+by)²+(bx-ay)²=
答
1.x²-xy-30y²=(x+5y)(x-6y)2 x^5-x³y²-12xy^4=x(x^4-x^2y^2-12y^4)=x(x^2+3y^2)(x^2-4y^2)=x(x+2y)(x-2y)(x²+3y²)3.7p²-5pq-2q²=(7p+2q)(p-q)4.6x²-5xy-6y²=(2x-...