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3a+2b=5ab 5y﹣3y=2 3x2y﹣2yx2=x2y ﹣3x+5x=﹣8x
-4x2-5y -4x2+5y (4x2-5y)2 (4x+5y)2
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
(y﹣x)(x+y) (2x﹣y)(﹣y+2x) (x﹣3y)(x+3y) (4x﹣5y)(5y+4x)
7a+a=7a2 3x2y-2yx2=x2y 5y-3y=2 3a+2b=5ab
3a+2b=5ab 2ab-2ba=0 5y2-2y2=3 3x2y-5xy2=2x2y
(x-5y+1)(x-5y-8) (x-5y+4)(x-5y-2) (x-5y-4)(x-5y-2) (x-5y-4)(x-5y+2)
x=3,y=2 x=2,y=3 x=0,y=5 x=5,y=0
7a+a=7a2 5y﹣3y=2 3x2y﹣2yx2=x2y 3a+2b=5ab
2x<3y<5z 3y<2x<5z 5z<3y<2x 5z<2x<3y
(xy)3=xy3 x5÷x5=x 3x2•5x3=15x5 5x2y3+2x2y3=10x4y9
(y﹣x)(x+y) (2x﹣y)(﹣y﹣2x) (x﹣3y)(﹣3y+x) (4x﹣5y)(5y+4x)
(x+1)(x+4)=x2+5x+4 (y+4)(y-5)=y2+9y-20 (m+2)(m-3)=m2-m-6 (x-3)(x-6)=x2-9x+18
3x2y﹣2yx2=x2y 5y﹣3y=2 7a+a=7a2 3a+2b=5ab