Please think of it this way:

First time: 1 heads? 2 Frontal 2 minutes

Second time: 1 tail? 2 minutes and 2 tails

So it takes four minutes to bake two cakes.

(2)? How many minutes does it take to bake three cakes?

Please think of it this way:

First time: 1 heads? 2 Front 2 minutes

Second time: 1 tail? 3 Frontal 2 minutes

The third time: 2 tails? 3 tails for 2 minutes

So it takes six minutes to bake three cakes.

Summary: The number of pancakes is different, and the method of pancakes is also different, that is, when the number of pancakes is even,

As long as two are branded; When the number of pancakes is odd, it is necessary to arrange the three as a whole.

The rest of the cake was baked in half. .

Rule: number of cakes × number of pots × baking time per side = total time.