(2x-y+z)(2x+y-z) 用乘法公式计算
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(2x-y+z)(2x+y-z) 用乘法公式计算
(2x-y+z)(2x+y-z) 用乘法公式计算
(2x-y+z)(2x+y-z) 用乘法公式计算
(2x-y+z)(2x+y-z)
=4x^2-(y-z)^2
=4x^2-y^2-z^2+2yz
(2x-y+z)(2x+y-z) = [(2x-(y-z))][(2x+(y-z))] = 4x^2-(y-z)^2 = 4x^2 - y^2+2yz - z^2
(2x-y+z)(2x+y-z)
=[2x-(y-z)][2x+(y-z)]
=(2x)²-(y-z)²
=4x²-(y²-2yz+z²)
=4x²-y²+2yz-z²
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