(x-y+z)( )=z²-(x-y)²,问括号内填?
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(x-y+z)()=z²-(x-y)²,问括号内填?(x-y+z)()=z²-(x-y)²,问括号内填?(x-y+z)()=z²-(x-y)²
(x-y+z)( )=z²-(x-y)²,问括号内填?
(x-y+z)( )=z²-(x-y)²,问括号内填?
(x-y+z)( )=z²-(x-y)²,问括号内填?
(x-y+z)( z-x+y)=z²-(x-y)²
z²-(x-y)²=(z+x-y)(z-x+y)