The calculation formula of the pancake problem is: the time of one-sided pancake × the number of pancakes = the total time of pancake.

Analysis: The formula for pancakes is the time for one-sided pancakes × the number of pancakes = the total time for pancakes. When frying pancakes, there should be no room left in the pan to save time. Even-numbered pancakes should be panned at the same time, and odd-numbered pancakes should be panned in rotation.

When the calculated time is not an integer, the further method is used to obtain an approximate number. For example, if the number of cakes is 4 and the number of pieces in each pot is 3, the total time according to the formula is 3 minutes. Assuming that each pancake is separated from the middle, each pancake only needs to be baked on one side. 4 double-sided pancakes become 8 single-sided pancakes. 3 pancakes are pancaked at a time, and a total of 3 pancakes are required. Finally, Only bake 2 sides at a time, total time 3 minutes.

Practical combat on the pancake problem.

To bake 3 cakes at a time, one cake needs to be baked on both sides, 3 minutes on each side. How long does it take to bake 10 cakes at least?

Analysis: For the more complex pancake problem, although the "enumeration method" can still be used to solve it, it is more complicated. Below we use a purely computational method to solve this problem.

Assuming that each cake is separated from the middle, each cake only needs to be baked on one side. 10 double-sided cakes become 20 single-sided cakes. Baking 3 sheets at a time, the total is ** *It takes 7 times to bake, and the last time only bakes 2 sides, the total time is 21 minutes.