2x2+2y2-2(2x2+xy-3y2+xy)4x2-2y2+xy2-3(-3x2+5y2-2xy2)-4ab+5ac-3bc+5ab-6ac-6cbyx²-y+x²y+x-2(xy²-yx) 5x²−6x³+3x³−2x+3x²+x²−x³−x
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2x2+2y2-2(2x2+xy-3y2+xy)4x2-2y2+xy2-3(-3x2+5y2-2xy2)-4ab+5ac-3bc+5ab-6ac-6cbyx²-y+x²y+x-2(xy²-yx) 5x²−6x³+3x³−2x+3x²+x²−x³−x
2x2+2y2-2(2x2+xy-3y2+xy)
4x2-2y2+xy2-3(-3x2+5y2-2xy2)
-4ab+5ac-3bc+5ab-6ac-6cb
yx²-y+x²y+x-2(xy²-yx)
5x²−6x³+3x³−2x+3x²+x²−x³−x
2x2+2y2-2(2x2+xy-3y2+xy)4x2-2y2+xy2-3(-3x2+5y2-2xy2)-4ab+5ac-3bc+5ab-6ac-6cbyx²-y+x²y+x-2(xy²-yx) 5x²−6x³+3x³−2x+3x²+x²−x³−x
2x2+2y2-2(2x2+xy-3y2+xy)
=2x²+2y²-4x²-2xy+6y²-2xy
=-2x²+8y²-4xy
4x2-2y2+xy2-3(-3x2+5y2-2xy2)
=4x²-2y²+xy²+9x²-15y²+6xy²
=13x²+7xy²-17y²
-4ab+5ac-3bc+5ab-6ac-6cb
=ab-ac-9bc
yx²-y+x²y+x-2(xy²-yx)
=x²y-y+x²y+x-2xy²+2xy
=2x²y+x-y+-2xy²+2xy
5x²−6x³+3x³−2x+3x²+x²−x³−x
=-4x³+9x²-3x
1.2X2+2Y2-2(2X2+XY-3Y2+XY)=8Y2-2X2-4XY
2.4X2-2Y2+XY2-3(-3X2+5Y2-2XY2)==13X2-17Y2+7XY2
3.-4AB+5AC-3BC+5AB-6AC-6CB=AB-AC-9BC
4.YX^2-Y+X^2Y+X-2(XY^2-YX)=2X^2Y-2XY^2-Y+X+2XY
5.5X^2-6X^3+3X^3-2X+3X^2+X^2-X^3-X=9X^2-4X^3-3X
1、2x2+2y2-2(2x2+xy-3y2+xy)
=2x²+2y²-4x²-2xy+6y²-2xy
=-2x²+8y²-4xy
2、4x2-2y2+xy2-3(-3x2+5y2-2xy2)
=4x²-2y²+xy²+9x²...
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1、2x2+2y2-2(2x2+xy-3y2+xy)
=2x²+2y²-4x²-2xy+6y²-2xy
=-2x²+8y²-4xy
2、4x2-2y2+xy2-3(-3x2+5y2-2xy2)
=4x²-2y²+xy²+9x²-15y²+6xy²
=13x²+7xy²-17y²
3、4ab+5ac-3bc+5ab-6ac-6cb
=ab-ac-9bc
4、yx²-y+x²y+x-2(xy²-yx)
=x²y-y+x²y+x-2xy²+2xy
=2x²y+x-y+-2xy²+2xy
5、 5x²−6x³+3x³−2x+3x²+x²−x³−x
= 5x²+3x²+x²−6x³+3x³−x³−x−2x
=-4x³+9x²-3x
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