(x+2y-z)(x-2y+z)
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(x+2y-z)(x-2y+z)
(x+2y-z)(x-2y+z)
(x+2y-z)(x-2y+z)
(x+2y-z)(x-2y+z)
=[x+(2y-z)][x-(2y-z)]
=x^2-(2y-z)^2
=x^2-4y^2+4yz-z^2
打字不易,
原式=[x+(2y-z)][x-(2y-z)]
=x²-(2y-z)²
=x²-4y²+4yz-z²
利用公式(a+b)(a-b)=a²-b²
原式=【x+(2y-z)】【x-(2y-z)】
=x²-(2y-z)²
=x²-4y²+4yz-z²
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