(x-3y)(-3y-x)-2(x-3y)＾2要过程

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(x-3y)(-3y-x)-2(x-3y)＾2要过程
(x-3y)(-3y-x)-2(x-3y)＾2要过程

(x-3y)(-3y-x)-2(x-3y)＾2要过程
=-(x-3y)(x+3y)-2(x-3y)²
=-9y²-3x²+12xy
=-3(3y²-4xy+x²)
=-3(3y-x)(y-x)
=3(x-3y)(y-x)

(x-3y)(-3y-x)-2(x-3y)＾2
=(x-3y)(-3y-x-2x+6y)
=(x-3y)(-3x+3y)
=3(x-3y)(-x+y)

=-(X+3Y)(X-3Y)-2(X-3Y)^2
=-(X-3Y)(X+3Y+2X-6Y)
=-(X-3Y)(3X-3y)
=-3(x-3y)(x-y)

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