既然都不回答,那么哥哥给你解答吧!a卫星围绕地球做圆周运动,有GMma/(R+R)^2=ma(2π/Tb)^2(R+R),得：Ta=4πR 2^0.5 (R/GM)^0.5 (1)b卫星围绕地球做圆周运动,有GMmb/(R+3R)^2=mb(2π/Tb)^2(R+3R),得：Tb=16πR(R/GM)^0...