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2x2y3+y+3xy 2x2y2﹣2y+3xy 2x2y3+2y﹣3xy 2x2y3+y﹣3xy
(﹣2a2b3)÷(﹣2ab)=a2b2 (3x2y﹣6xy)÷6xy=0.5x (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy (3x2y+xy)÷xy=3x
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
X2+2Y22XY2 2X2+Y22X2Y 3X2+Y22X3Y X2+3Y22XY3
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
X2+2Y2 2XY2 2X2+Y2 2X2Y 3X2+Y2 2X3Y X2+3Y2 2XY3
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
X2+2Y22XY2 2X2+Y22X2Y 3X2+Y22X3Y X2+3Y22XY3
X2+2Y2==2XY2 2X2+Y2==2X2Y 3X2+Y2==2X3Y X2+3Y2==2XY3
8x2y-24xy2=8xy(x-3y); ax+bx+ay+by=x(a+b)+y(a+b) 12x2y+14x2y2-2xy=2xy(6x+7xy-1); x3-8=(x-2)(x2+2x+4)
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
4x2y2 -4x2y2 -12x3y3 12x3y3