①(-2x-1/3y)²=____②{(-5+x)(-5-x)}²=_____③(x+y+z)(x-y-z)=___.④若x²+y²快
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①(-2x-1/3y)²=____②{(-5+x)(-5-x)}²=_____③(x+y+z)(x-y-z)=___.④若x²+y²快①(-2x-1/3y)
①(-2x-1/3y)²=____②{(-5+x)(-5-x)}²=_____③(x+y+z)(x-y-z)=___.④若x²+y²快
①(-2x-1/3y)²=____②{(-5+x)(-5-x)}²=_____③(x+y+z)(x-y-z)=___.④若x²+y²
快
①(-2x-1/3y)²=____②{(-5+x)(-5-x)}²=_____③(x+y+z)(x-y-z)=___.④若x²+y²快
①(-2x-1/3y)²=4x²+4/3x+1/9y²
②{(-5+x)(-5-x)}²
=(25-x²)²
=625-50x²+x^4
③(x+y+z)(x-y-z)
=x²-(y+z)²
=x²-y²-z²-2yz