已知地球在近日点时距离太阳 ,速率为 ,在远日点时距离太阳 ， 则地球在远日点的速率https://mooc1.chaoxing.com/ananas/latex/p/1009https://mooc1.chaoxing.com/ananas/latex/p/433https://mooc1.chaoxing.com/ananas/latex/p/1051126https://mooc1.chaoxing.com/ananas/latex/p/230079