(x-y+z)( )=z²-(x-y)²,问括号内填?
问题描述:
(x-y+z)( )=z²-(x-y)²,问括号内填?
答
(x-y+z)( z-x+y)=z²-(x-y)²
z²-(x-y)²=(z+x-y)(z-x+y)