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4x-9x+6x=-x a - a = 0 x3 – x2 = x -4xy - 2xy = -2xy
(﹣2a2b3)÷(﹣2ab)=a2b2 (3x2y﹣6xy)÷6xy=0.5x (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy (3x2y+xy)÷xy=3x
3x2y-4xy2; x2y-4xy2; x2y+2xy2; -x2y-2xy2
﹣3a+4a=﹣7a 4m+2n=6mn 5x+4x=20x2 6xy3﹣2xy3=4xy3
4xy+xy=5xy x+2x=2x² 5xy-3xy=2 x+y=xy
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
)x2(m+1)÷xm+1=x2 ( )(xy)8÷(xy)4=(xy)2 ( )x10÷(x7÷x2)=x5 ( )x4n÷x2n·x2n=1
12xy-4x 12xy-10x 12xy-8x 12xy-2x
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
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
4x﹣9x+6x=﹣x xy﹣2xy=3xy x3﹣x2=x
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
-x2-y2 = -(x+y)(x-y) x2y+2xy+4y = y(x+2)2 -49x2+x2y2 = (xy+7x)(xy-7x) 16x2+4y2-16xy = 4(2x-y)2