(x+y)³-xy(x+y)=(x+y)*A,则A=?
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 09:04:22
(x+y)³-xy(x+y)=(x+y)*A,则A=?(x+y)³-xy(x+y)=(x+y)*A,则A=?(x+y)³-xy(x+y)=(x+y)*A,则A=?(x+y
(x+y)³-xy(x+y)=(x+y)*A,则A=?
(x+y)³-xy(x+y)=(x+y)*A,则A=?
(x+y)³-xy(x+y)=(x+y)*A,则A=?
(x+y)³-xy(x+y)
=(x+y)[(x+y)²-xy]
=(x+y)(x²+2xy+y²-xy)
=(x+y)(x²+xy+y²)
所以A=x²+xy+y²
x的平方加上y的平方加上xy的积