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y1>y2>y3 y2> y1> y3 y2>y3> y1 y3> y2> y1
(x-2y)(2y+x) (-2y-x)(x+2y) (x-2y)(-x-2y) (2y-x)(-x-2y)
(x﹣2y)(2y+x) (﹣2y﹣x)(x+2y) (x﹣2y)(﹣x﹣2y) (2y﹣x)(﹣x﹣2y)
p=(y1+y2-a)/2 p=a+y1-y2 p=(a+y1-y2)/2 p=(a+y2-y2)/2
(﹣3,y1)、 (﹣1,y2)、 (1,y3)都在反比例函数Y=(k<0)的图象上,则y1、y2、y3的大小关系是( ) A.y1<y2<y3B.y3<y2<y1C.y3<y1<y2 y2<y1<y3
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
[x-(2y+1)]2 [x-(2y-1)][x+(2y-1)] [(x-2y)+1][(x-2y)-1] [x+(2y-1)]2
(x+y)2·(x-y)2 (x+y)2(-x-y) (x+y)2+2(x+y)2 (x-y)2(-x-y)
(x+2y)(2x-y) (x+y)(x-2y) (x+2y)(2y-x) (x-2y)(2y-x)
[x﹣(2y+1)]2 [x+(2y﹣1)][x﹣(2y﹣1)] [(x+2y)﹣1][(x﹣2y)+1] [x+(2y+1)]2
(x+y)2=x2+y2 (x﹣y)2=x2﹣2xy﹣y2 (x+2y)(x﹣2y)=x2﹣2y2 (﹣x+y)2=x2﹣2xy+y2
(x+y)2=x2+y2 (x﹣y)2=x2﹣2xy﹣y2 (x+2y)(x﹣2y)=x2﹣2y2 (﹣x+y)2=x2﹣2xy+y2
y1 > y2 y1 = y2 y1 < y2 不能比较