问题描述：
a question about the tree
If the lowest branch of a tree is 5 feet off the ground,and the tree grows 2 feet per year in height,how far away will that branch be off the ground 3 years later?
Why?
If the lowest branch of a tree is 5 feet off the ground,and the tree grows 2 feet per year in height,how far away will that branch be off the ground 3 years later?
Why?
问题解答：
我来补答展开全文阅读