How did the mathematical formula of the second volume of the sixth grade bicycle come from? If you have a satisfactory answer, you will be rewarded with 10 points.

1. This means that the length of chain rotation of front and rear wheels is the same (involving the concept of linear speed).

2. Speaking of the concept of angular velocity, the number of revolutions of the rear wheel and the rear gear is the same, so only the number of revolutions is needed. The distance between the front and rear gears is the same, so it's easy to bring it in.

You do math problems.

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