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5xy﹣4xy=1 3x2+2x3=5x5 x2﹣x=x 3x2+2x2=5x2
x3•x3=2x6 (xy2)3=xy6 (a3)2=a5 t10÷t9=t
(xy)3=xy3 x5÷x5=x 3x2•5x3=15x5 5x2y3+2x2y3=10x4y9
2x2﹣xy= 2x(x﹣y) ﹣xy2+2xy﹣y=﹣y(xy﹣2x) 2x2﹣8x+8=2(x﹣2)2 x2﹣x﹣3= x(x﹣1)﹣3 第1题
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
3a+2b=5ab 2ab-2ba=0 5y2-2y2=3 3x2y-5xy2=2x2y
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
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
3x2y与-3xy2 3xy与-2yx 2x与2x2 5xy与5yz