(x+y+z)(x-y-z)=

2026年09月25日 13:24
有5个网友回答
网友(1):

(x+y+z)(x-y-z)
=[x+(y+z)][x-(y+z)] (平方差公式)
=x²-(y+z)²
=x²-y²-2yz-z²

网友(2):

(x+y+z)(x-y-z)
=(x+y+z)[x-(y+z)]
=x^2-(y+z)^2
=x^2-y^2-z^2-2yz

网友(3):

4yz =[(-y-z) x][(-y-z)-x]-[(-y z)-x][(-y z) x] 套公式得 =4yz 等于4YZ

网友(4):

(x+y+z)(x-y-z)=x²-(y+z)²=x²-y²-z²-2yz

网友(5):

(x+y+z)(x-y-z)
=(x+(y+z))(x-(y+z))
=x²-(y+z)²
=x²-(y²+2yz+z²)
=x²-y²-z²-2yz