有7袋糖,其中6袋每袋800g,另1袋不是800g,你能没有砝码的天平称出来吗?至少称多少

至少称3次。
1.先各拿2袋糖放在天平两端。
【一:两边平衡】
那么再在剩余3袋糖中各拿2袋，和上一次操作的任意两包糖称，
[平衡]剩余的一袋为不是800g的
[不平衡]再把这两袋糖的其中一袋和第一次操作的糖称
（平衡）剩下的糖为不是800g的
（不平衡）拿过来的糖不是800g的
【二：两边不平衡】
那么剩余的3袋糖都是800g的，接下来的操作与
【一:两边平衡】相同。

所以无论怎么样，都要称3次可以找出来。

（提示，不能直接拿3袋和3袋称，因为另1袋不知道是大于800g还是小于800g）

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