there are 60 birds in the tree.After a while,47 birds fly to the secong tree.then there are 20 birds in every tree.do you know how many birds are in every tree at first?the 1st tree:the2nd tree:the 3rd tree:
问题描述：
there are 60 birds in the tree.After a while,47 birds fly to the secong tree.then there are 20 birds in every tree.do you know how many birds are in every tree at first?the 1st tree:the2nd tree:the 3rd tree:
答
20
答
有60只鸟在树上。过了会儿，47只飞向（注意是飞向）第二棵树上。然后每棵树上有20只鸟。你知道最初每棵树上有多少只鸟么？ 第一棵树（） 第二棵树（） 第三棵树（）
这道题好像有点难啊 算不太出来……
答
there are 20 birds in every tree.20
答
24 9 27