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2x2y3+y+3xy 2x2y2﹣2y+3xy 2x2y3+2y﹣3xy 2x2y3+y﹣3xy
(﹣2a2b3)÷(﹣2ab)=a2b2 (3x2y﹣6xy)÷6xy=0.5x (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy (3x2y+xy)÷xy=3x
x3﹣4x2+4x=x(x2+4x+4) x2y﹣xy2=xy(x﹣y) x2﹣y2=(x﹣y)(x+y) x2﹣2xy+y2=(x﹣y)2
3x2y-4xy2; x2y-4xy2; x2y+2xy2; -x2y-2xy2
4x与4 y 4y与4xy 4xy2与4x2y 4xy2与4y2x
23±2.81 23±3.15 23±3.24 23±3.92
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
x2 –2xy+y2=x(x-2y)+y2 x2-16y2=(x+8y)(x-8y)
x2+xy+y2=(x+y)2 x4y4-1=(x2y2+1)(xy+1)(xy-1)
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
与多项式 =2x2-3xy-y2的和是多项式 =x2+xy+y2,则A.等于( ) A. x2-4xy-2y2 B. -x2+4xy+2y2 C. 3x2-2xy-2y2 3x2-2xy
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
(-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