(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(x+y)^2-z^2=x^2+y^2+2xy-z^2等于(X+Y)2-Z22带表平方
(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
(x+y)^2-z^2=x^2+y^2+2xy-z^2
等于(X+Y)2-Z2 2带表平方
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