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X2+2Y2===2XY2 2X2+Y2===2X2Y 3X2+Y2===2X3Y X2+3Y2===2XY3
X2+2Y2 ==2XY2 2X2+Y2 ==X2Y 3X2+Y2 ==2X3Y X2+3Y2 ==2XY3
(x+2y-3z)(x-2y-3z). (x-2y-3z)(x-2y+3z) (x+2y+3z)(x+2y-3z). (x+2y+3z)(x-2y-3z)
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
y (x﹣y)2 y (x + y)(x﹣y) y (x + y)2 y (x2﹣2xy + y2)
3X2+Y2===2X3Y 2X2+Y2===2X2Y X2+2Y2===2XY2 X2+3Y2===2XY3
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
4x2y2 -4x2y2 -12x3y3 12x3y3