计算 (2x+y-z+5)*(2x-y+z+5)
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计算(2x+y-z+5)*(2x-y+z+5)计算(2x+y-z+5)*(2x-y+z+5)计算(2x+y-z+5)*(2x-y+z+5)=【(2x+5)+(y-z)】*【(2x+5)-(y-z)】=
计算 (2x+y-z+5)*(2x-y+z+5)
计算 (2x+y-z+5)*(2x-y+z+5)
计算 (2x+y-z+5)*(2x-y+z+5)
=【(2x+5)+(y-z)】*【(2x+5)-(y-z)】
=(2x+5)^2-(y-z)^2
=4x^2+20x+25-y^2+2yz-z^2
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计算 (2x+y-z+5)*(2x-y+z+5)
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运用乘法公式计算1:(x+y+2z)(x-y-2z)2:(x+2y-z)²