问题 解答题

(1)化简:(x+3y)2+(2x+y)(x-y).

(2)分解因式:x3-2x2y+xy2

答案

(1)原式=x2+6xy+9y2+(2x+y)(x-y)

=x2+6xy+9y2+2x2-2xy+xy-y2

=3x2+5xy+8y2

(2)原式=x(x2-2xy+y2)=x(x-y)2

单项选择题
单项选择题