x^2/4+y^2/3=1右焦点C=√(a^2-b^2)=1AB:y=x-1x^2/4+(x-1)^/3=1(3x^2+4x^2-8x+4)=12 7x^2-8x-8=0这个圆圆心（(x1+x2)/2,(y1+y2)/2）(x1+x2)/2=4/7(y1+y2)/2=((x1-1)+(x2-1))/2=-3/7直径长√((y2-y1)^2+(x2-x1)^2)(y...