x²-2xy+y²分之x²+2xy-3y³如何因式分解RT.

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x²-2xy+y²分之x²+2xy-3y³如何因式分解RT.
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x²-2xy+y²分之x²+2xy-3y³如何因式分解RT.
x²-2xy+y²分之x²+2xy-3y³如何因式分解
RT.

x²-2xy+y²分之x²+2xy-3y³如何因式分解RT.
(x+3y)(x-y)/(x-y)(x-y)
=x+3y/x-y

x²-2xy+y²分之x²+2xy-3y²
=(x+3y)(x-y)/(x-y)²
=x+3y/x-y
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