(x+y)(x-y)+3y^2怎么做?
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(x+y)(x-y)+3y^2怎么做?(x+y)(x-y)+3y^2怎么做?(x+y)(x-y)+3y^2怎么做?解(x+y)(x-y)+3y²=x²-y²+3y
(x+y)(x-y)+3y^2怎么做?
(x+y)(x-y)+3y^2怎么做?
(x+y)(x-y)+3y^2怎么做?
解
(x+y)(x-y)+3y²
=x²-y²+3y²
=x²+2y²
=x^2-y^2+3y^2
=x^2+2y^2
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