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3x+3y=6xy x+x=x2 16y2﹣9y2=7 9a2b﹣9ba2=0
a3+a3=a6 (3x)2=6x2 (x+y) 2= x2+y2 (-x-y)(y-x)=x2-y2
(﹣2xy)2=﹣4x2y2 x6÷x3=x2 (x﹣y)2=x2﹣y2 2x+3x=5x
(x+2y)(2x-y) (x+y)(x-2y) (x+2y)(2y-x) (x-2y)(2y-x)
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
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
x4+x4=2x8 x3•x2=x6 (x2y)3=x6y3 (x﹣y)(y﹣x)=x2﹣y2
X2+2Y2==2XY2 2X2+Y2==2X2Y 3X2+Y2==2X3Y X2+3Y2==2XY3