来自彭其美的问题
【(1)分解因式:a3b-ab3(2)化简:(x+3y)2+(2x+y)(x-y).】
(1)分解因式:a3b-ab3
(2)化简:(x+3y)2+(2x+y)(x-y).
1回答
2020-04-11 18:22
【(1)分解因式:a3b-ab3(2)化简:(x+3y)2+(2x+y)(x-y).】
(1)分解因式:a3b-ab3
(2)化简:(x+3y)2+(2x+y)(x-y).
(1)a3b-ab3=ab(a2-b2)=ab(a+b)(a-b);
(2)(x+3y)2+(2x+y)(x-y),
=x2+6xy+9y2+(2x+y)(x-y),
=x2+6xy+9y2+2x2-2xy+xy-y2,
=3x2+5xy+8y2.