(x+y-z)(x-y+z)=等于多少
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(x+y-z)(x-y+z)=等于多少(x+y-z)(x-y+z)=等于多少(x+y-z)(x-y+z)=等于多少原式=(x-(z-y))*(x+(z-y))=x^2-(z-y)^2=x^2-z^2-
(x+y-z)(x-y+z)=等于多少
(x+y-z)(x-y+z)=等于多少
(x+y-z)(x-y+z)=等于多少
原式=(x-(z-y))*(x+(z-y))
=x^2-(z-y)^2
=x^2-z^2-y^2+2zy
去括号的x+y-z乘x-y+z
x乘x+y-y-z+z得x的平方
⊙﹏⊙b汗 打字好慢但终于打完了 O(∩_∩)O~
x 平方-(y-z)平方
x-y+z=0或x+y-z=0
则x=y-z或x=z-y
则x=-x故x=0
同理可求的xy分别为零
x^2-z^2-y^2+2zy
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