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x3﹣4x2+4x=x(x2+4x+4) x2y﹣xy2=xy(x﹣y) x2﹣y2=(x﹣y)(x+y) x2﹣2xy+y2=(x﹣y)2
y=2x+8 y=-2+4x y=-2x+8 y=4x
2x2-4y2=1 2x2-4y2=2 2y2-4x2=1 2y2-4x2=3
y=2x+8 y=﹣2+4x y=﹣2x+8 y=4x
-2x+3y 2x-3y -2x-3y 2x+3y
3x2﹣6x=x(3x﹣6) ﹣a2+b2=(b+a)(b﹣a) 4x2﹣y2=(4x+y)(4x﹣y) 4x2﹣2xy+y2=(2x﹣y)2
x2+y2-4x=0 x2+y2+4x=0 x2+y2-2x-3=0 x2+y2+2x-3=0
, ,则过A.B.及原点O.三点的圆的方程是( ) A.x2+y2+4x﹣3y=0B.x2+y2﹣4x﹣3y=0 x2+y2+4x﹣3y﹣4=0 x2+y2﹣4x﹣3y+8=0
(4,0), (0,3),O.(0,0)则△AOB外接圆的方程是( ) A.x2+y2+4x﹣3y=0B.x2+y2﹣4x﹣3y=0 x2+y2+4x+3y=0 x2+y2﹣4x+3y=0
y2=-8x y2=8x y2=-4x y2=4x