(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^2+xy+xz-xy-y^2-xz+xz+zy+z^2(开括号)
=x^2+2xz+z^2-y^2(化简)
=(x+z)^2-y^2
最后一步要不要随你吧
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