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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)
(x+3)2+(y﹣2)2= (x﹣3)2+(y+2)2= (x+3)2+(y﹣2)2=2 (x﹣3)2+(y+2)2=2
x﹣2y=0 x+2y=0 2x﹣y=0 2x+y=0
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
5 2 2
y=2x+2 y=2x﹣6 y=2x﹣4 y=2(x+3)
x2+y2+4y-6=0 x2+y2+4x-6=0 x2+y2-2y=0 x2+y2+4y+6=0
圆(x+1)2+(y+2)2=5 圆(x﹣1)2+(y﹣2)2=5 圆x2+y2﹣2x﹣4y=0的一段弧 圆x2+y2+2x+4y=0的一段弧
, ,则线段AB的垂直平分线的方程是( ) A.x+y﹣1=0B.2x﹣y+1=0 x﹣2y+1=0 x﹣y+1=0
y=2x y=-2x+4 y=2x或y=-2x+4 y=-2x或y=2x+4
6 0 2 2
x+2=0,7x﹣24y+14=0 y+2=0,7x+24y+14=0 x+2=0,7x+24y+14=0 y+2=0,7x﹣24y+14=0