1、x^2+y^2-6x-6=0.(1)x^2+y^2-4y-6=0.(2)(1)-(2):公共弦直线方程：3x-2y=0,两圆相交于两点y=1.5xx^2+(1.5x)^2-6x-6=03.25x^2-6x-6=0x1+x2=6/3.25x1*x2=-6/3.25(x1-x2)^2=(x1+x2)^2-4x1*x2=114/10.5625(y1-y2)^2=[1.5*(x1-x2)]^2=2.25*114/10.5625=256.5/10.5625弦长^2=(x1-x2)^2+(y1-y2)^2=370.5/10.5625公共弦长度=到这你应该会了。
2、加丽加、美洁王。
