(z+x+y)(z-x-y) 计算题!

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(z+x+y)(z-x-y)计算题!(z+x+y)(z-x-y)计算题!(z+x+y)(z-x-y)计算题!(z+x+y)(z-x-y)=[z+(x+y)][z-(x+y)]=z^2-(x+y)^2=

(z+x+y)(z-x-y) 计算题!
(z+x+y)(z-x-y) 计算题!

(z+x+y)(z-x-y) 计算题!
(z+x+y)(z-x-y) =[z+(x+y)][z-(x+y)]=z^2-(x+y)^2=z^2-[x^2+y^2+2xy]=z^2-x^2-y^2-2xy
"^2"为平方

[z+(x+y)]*[z-(x+y)]=z^2-(x+y)^2=z^2-x^2-y^2+2xy

(z+x+y)(z-x-y)=[z-(x+y)][z-(x+y)]
=z`2-(x+y)`2

(z+x+y)(z-x-y) =[z+(x+y)][z-(x+y)]=z^2-(x+y)^2=z^2-[x^2+y^2+2xy]=z^2-x^2-y^2-2xy