如何证明(y²-x²)=(y+x)(y-x)?
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如何证明(y²-x²)=(y+x)(y-x)?
如何证明(y²-x²)=(y+x)(y-x)?
如何证明(y²-x²)=(y+x)(y-x)?
(Y+X)(Y-X)=Y^2-XY+XY-X^2=Y^2-X^2
后面展开y2-x2=y2+xy-yx-x2
=y2-x2
(Y+X)(Y-X)=Y^2-XY+XY-X^2=Y^2-X^2