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-4x2-5y -4x2+5y (4x2-5y)2 (4x+5y)2
3a﹣2a=1 ﹣m﹣m=m2 2x2+2x2=4x4 7x2y3﹣7y3x2=0
y=﹣4x+3 y=﹣4x﹣3 y=4x+3 y=4x﹣3
y=-4x,y=5-4 y=4x-4,y=4x+3 y=4x,y=5x-4 y=4x,y=4x+3
2x2-4y2=1 2x2-4y2=2 2y2-4x2=1 2y2-4x2=3
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
3x2﹣6x=x(3x﹣6) ﹣a2+b2=(b+a)(b﹣a) 4x2﹣y2=(4x+y)(4x﹣y) 4x2﹣2xy+y2=(2x﹣y)2
x3·(x5)2=x13 (-2x3y)2=4x6y2 (-x)6÷(-x)3=x3 (x2-4x)÷x=x-4
x2+y2-4x=0 x2+y2+4x=0 x2+y2-2x-3=0 x2+y2+2x-3=0
(﹣4x+3y)(4x+3y) (4x﹣3y)(3y﹣4x) (﹣4x+3y)(﹣4x﹣3y) (4x+3y)(4x﹣3y)
y=4x y=4x﹣4 y=4x+8 y=4x或y=4x﹣4
, ,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