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2x+(﹣3y+4z) 2x+(3y﹣4z) 2x+(﹣3y﹣4z) 2x+(3y+4z)
2x+(﹣3y+4z) 2x+(3y﹣4z) 2x+(﹣3y﹣4z) 2x+(3y+4z)
5x﹣2x=3x 5ab﹣5ba=0 4x2y﹣5xy2=﹣x2y 3x2+2x2=5x2
x与y 2a2b与2ab2 abc与ac 2mn与﹣3mn
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
(1+x2)/(1+2y)=C(以上各式中,C为任意常数) (1+x2)(1+2y)=C(以上各式中,C为任意常数) (1+2y)2=C/(1+x2)(以上各式中,C为任意常数) (1+x2)2(1+2y)=C(以上各式中,C为任意常数)
X2+2Y2 2XY2 2X2+Y2 2X2Y 3X2+Y2 2X3Y X2+3Y2 2XY3
﹣(2x+y)=﹣2x+y 2(x﹣y)=2x﹣y 3x﹣(2y+z)=3x﹣2y﹣z x﹣(﹣y+z)=x﹣y﹣z
3m﹣m=2 a2b﹣ab2=0 2x+3y=5xy xy﹣2xy=﹣xy
3x+2x2=5x3 2a2b﹣a2b=1 ﹣ab﹣ab=0 ﹣x2y+yx2=0
X2+2Y2==2XY2 2X2+Y2==2X2Y 3X2+Y2==2X3Y X2+3Y2==2XY3