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(﹣2xy)2=﹣4x2y2 x6÷x3=x2 (x﹣y)2=x2﹣y2 2x+3x=5x
(xy)3=xy3 x5÷x5=x 3x2•5x3=15x5 5x2y3+2x2y3=10x4y9
5x+3x=8 2x+3y=5xy 3ab﹣ab=2ab ﹣(a﹣b)=﹣a﹣b
3x+y=4xy 2x2+3x2=5x4 6x2﹣3x2=3 5xy﹣3xy=2xy
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
5x﹣2x=3x 5ab﹣5ba=0 4x2y﹣5xy2=﹣x2y 3x2+2x2=5x2
2x+3y=5xy x6÷x2=x3 x2·x3=x5 (-x3)3=x6
2x+3y=5xy (﹣2x2)3=﹣6x6 3y2•(﹣y)=﹣3y2 6y2÷2y=3y
2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4