(x-y/3)^2-(x+y/3)^2因式分解

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(x-y/3)^2-(x+y/3)^2因式分解
(x-y/3)^2-(x+y/3)^2因式分解

(x-y/3)^2-(x+y/3)^2因式分解
(x-y/3)^2-(x+y/3)^2
=X^2-2XY/3+Y^2/9-X^2-2XY/3-Y^2*9
=-4XY/3

(x-y/3)^2-(x+y/3)^2
=[(x-y/3)+(x+y/3)]*[(x-y/3)-(x+y/3)]
=2x*(-2y/3)
=-4xy/3

(x-y/3)^2-(x+y/3)^2
＝（x-y/3+x+y/3）（x-y/3-x-y/3）
=2x*-2/3y
=-4/3xy

-4xy/3

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