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 yo

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• 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:
• 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:
• There are 60 birds in three trees.After a while 4 birds fly to the second tree from the frist treeand 7 birds fly to the third tree from the second tree.Then there are 20 birds in every tree.Do you know how many birds are there in every tree at first?Key:____(the 1st tree),____(the 2nd tree),____(the 3rd tree)
• 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 yo
• 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 yo
• 1+3+5+...+501-2-4-6-...-500
• 在地球赤道上的A处静止放置一个小物体，现在设想地球对小物体的万有引力突然消失，则在数小时内，小物体相对于A点处的地面来说（　　） A.水平向东飞去 B.向上并渐偏向东方飞去 C.向