树上有一群小鸟,树下也有一群小鸟。树下的小鸟问树上有多少只小鸟,树上的小鸟对树下的小鸟说:“如果你们飞上来1/5,我们就一样多了。”树下的小鸟想,我们有15只,那么树上的小鸟有多少只呢?【思路点睛】树下的小鸟飞到树上去,树下的小鸟减少了,而树上的小鸟增加了。树下减少的小鸟数应该与树上增 There are a group of birds in the tree and a group of birds under the tree. The birds under the tree ask how many birds are in the tree, and the birds in the tree say to the birds under the tree: “If you fly up to 1/5, we will be as much.” Birds under the tree Think, we have 15, then the number of birds in the tree only? [Ideas dotted eyes] birds under the tree flew to the tree, reducing the number of birds under the tree, and the birds on the tree increased. The number of birds reduced under the tree should be increased with the tree