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右边方格图是一张长方形硬纸,正好分成15个大小相等的小正方形,试把它剪成若干份,使每份的小正方形一定要相连,且能折成无盖的正方体纸盒.最多能折成这样的纸盒多少个?怎样剪法?
The grid on the right is rectangular hard paper, which is divided into 15 small squares of equal size. Try to cut it into several pieces so that each small square must be connected and folded into a square box without cover. How many boxes can be folded into such a carton? How to cut it?