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a2+b2=(a+b)2 xy+xz+x=x(y+z) x2+x3=x3(+1) a2﹣2ab+b2=(a﹣b)2
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
5x﹣2x=3x 5ab﹣5ba=0 4x2y﹣5xy2=﹣x2y 3x2+2x2=5x2
(y﹣x)(x+y) (2x﹣y)(﹣y+2x) (x﹣3y)(x+3y) (4x﹣5y)(5y+4x)
a2+b2=(a+b)2 a2﹣2ab+b2=(a﹣b)2 x2+x3=x3(+1) x(y+z+1)=xy+xz+x
(-2,y1), (2,y2), (3,y3)都在反比例函数y=-的图象上, 则下列结论中正确的是 A.y1< y2< y3B.y3 < y2< y1C.y1< y3 < y2 y2 < y3 < y1
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
c1y1+c2y2+y3 c1y1+c2y2-(c1+c3)y3 c1y1+c2y2-(1-c1-c2)y3 c1y1+c2y2+(1-c1-c2)y3
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
如果2x=2y+1,那么x=y+1 如果2=5+3x,那么3x=5﹣2 如果x﹣3=y﹣3,那么x=y 如果﹣8x=4,那么x=﹣2
(x+5)(x-5)=x2-25 x2+x+1=x(x+1)+1 -2x2-2xy=-2x(x+y) 3x+6xy+9xz=3x(2y+9z)
a2﹣b2=(a﹣b)2 a2﹣2ab+b2=(a﹣b)2 xy+xz+x=x(y+z)
3a+2b=5ab 5y2-3y2=2 2ab-ab=ab 3x2y-5x2y=2x2y
(y﹣x)(x+y) (2x﹣y)(﹣y﹣2x) (x﹣3y)(﹣3y+x) (4x﹣5y)(5y+4x)
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5