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5xy﹣4xy=1 3x2+2x3=5x5 x2﹣x=x 3x2+2x2=5x2
(xy)3=xy3 x5÷x5=x 3x2•5x3=15x5 5x2y3+2x2y3=10x4y9
3x+y=4xy 2x2+3x2=5x4 6x2﹣3x2=3 5xy﹣3xy=2xy
12abc-9a2b2=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy-y=y(x2+5x)
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
2x+3y=5xy (﹣2x2)3=﹣6x6 3y2•(﹣y)=﹣3y2 6y2÷2y=3y
2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
(2x﹣3y)(2x+3y) (2x﹣3y)(﹣2x+3y) (2x﹣3y)(﹣2x﹣3y) (﹣2x+3y)(2x+3y)
x2﹣2(2x﹣y+2)=x2﹣4x﹣2y+4 ﹣3(m+n)﹣mn=﹣3m+3n﹣mn ﹣(5x﹣3y)+4(2xy﹣y2)=﹣5x+3y+8xy﹣4y2 ab﹣5(﹣a+3)=ab+5a﹣3
2x<3y<5z 3y<2x<5z 5z<3y<2x 5z<2x<3y
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
12abc-9a2b2=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy-y=y(x2+5x)