a²=169b²=144c²=25c=5所以焦点是(±5,0)M(x,y)所以√[(x+5)²+(y-0)²]/√[(x-5)²+(y-0)²]=2/3平方9(x²+10x+25+y²)=4(x²-10x+25+y²)(x+13)²+y²=144...