解:圆M:x2+y2+6x-2y=0(x+3)^2+(y-1)^2=10圆心M坐标:(-3,1)椭圆E:x2/25+y2/9=1A,B关于点M对称,则设A坐标为(a,b),则B坐标就是:(-6-a,2-b),那么有a^2/25+b^2/9=1(-6-a)^2/26+(2-b)^2/9=1(36+12a)/25+(4-4b)/9=0324+108a+100-100b=0108a-100b+424=027a-25b+106=0∵a,b就是直线L上的点,所以直线L的方程就是:27x-25y+106=0
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