因式分解:-1/3(xy+3)^2+3(3-xy)^2

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因式分解:-1/3(xy+3)^2+3(3-xy)^2
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因式分解:-1/3(xy+3)^2+3(3-xy)^2
因式分解:-1/3(xy+3)^2+3(3-xy)^2

因式分解:-1/3(xy+3)^2+3(3-xy)^2
-1/3(xy+3)^2+3(3-xy)^2
=(-1/3)[(xy+3)²-9(3-xy)²]
=(-1/3)(xy+3+3(3-xy))(xy+3-3(3-xy))
=(-1/3)(4xy+12)(4xy-6)
=(-8/3)(xy+3)(2xy-3);
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