（3x²-3y²）/（x+y）怎么算?

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（3x²-3y²）/（x+y）怎么算?
（3x²-3y²）/（x+y）怎么算?

（3x²-3y²）/（x+y）怎么算?
=3(x+y)(x-y)/(x+y)=3(x-y)

3（X2-Y2）/(X+Y)=3(X-Y)(X+Y)/(X+Y)=3(X-Y)

（3x^2-3y^2)/(x+y)
=3(x^2-y^2)/(x+y)
=3(x+y)(x-y)/(x+y)
=3(x-y)

（3x²-3y²）/（x+y） 怎么算?