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2x2y3+y+3xy 2x2y2﹣2y+3xy 2x2y3+2y﹣3xy 2x2y3+y﹣3xy
3x2y-4xy2; x2y-4xy2; x2y+2xy2; -x2y-2xy2
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
(x2)3=xy3 (xy)3=x3y3, 4x3y÷x=4x2y(x≠0) x2+x2=x4
4-x2+3x=(2-x)(2+x)+3x -x2+3x+4=-(x+4)(x-1) 1-4x+4x2=(1-2x)2 x2y-xy+x3y=x(xy-y+x2y)
(x-y)2=x2-y2 x2·y2 =(xy)4 x2y+xy2 =x3y3 x6÷y2 =x4
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
x2﹣2(2x﹣y+2)=x2﹣4x﹣2y+4 ﹣3(m+n)﹣mn=﹣3m+3n﹣mn ﹣(5x﹣3y)+4(2xy﹣y2)=﹣5x+3y+8xy﹣4y2 ab﹣5(﹣a+3)=ab+5a﹣3
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
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2