填一填。7L)w4]4U,g;m
7L)w4]4U,g;m
(1)大圆和小圆的直径比是1L:G)k,i0L'^5M*d。7L)w4]4U,g;m
(2)大圆和小圆的周长比是)t._8S)o'|9s-`。7L)w4]4U,g;m
(3)大圆和小圆的面积比是6o8Y'o.x3l-J*C2K3b(h,N1Z3?'b)[。7L)w4]4U,g;m