x-a 2 + y-b 2 r 2-标签分类-2025-12-13 04:57
必应
x-a 2 + y-b 2 r 2,
x-a 2 + y-b 2 c2,
x 2/a 2 + y 2/b 2,
x-h 2 + y-k 2 r 2,
b 2*x 2+a 2*y 2 a 2*b 2,
x/a+y/b 2 ax-by a2-b2,
x*2/a*2+y*2/b*2 1,
a/ x-b + b/ x-a 2,
a x-y +2b y-x +c x-y 2,
x 2+xy+y 2 x 2y 2,
x+y a-b ax-by a2+b2,
a-b x + a+b y a2-2ab-b2