There are several chickens and rabbits in a cage. Count it. * * * has 14 head and 38 legs. Clever boy, can you figure out how many chickens and rabbits there are?

1. Analysis: If the number of chickens is x, there are (14-x) rabbits, 2x+4( 14-x)=38, so there are 9 chickens, 14-9 rabbits =

2. Analysis: If the number of rabbits is X, there are (14-x) chickens, 4x+2( 14-x)=38. The solution is x=5, so there are 5 rabbits, 14-5=9 chickens.

The formula of chicken and rabbit in the same cage solves the equation 4X+ (total number -X)×2= total number of legs. Chickens and rabbits in the same cage is one of the famous typical anecdotes in ancient China. A formula that uses mathematical symbols to express the relationship between several quantities in natural sciences such as mathematics, physics, chemistry and biology.

It is universal and applicable to all similar problems. In mathematical logic, a formula is a formal grammatical object to express a proposition, but the proposition may depend on the free variable value of the formula. The precise definition of a formula depend on that specific formal logic involved.

The chicken and the rabbit are in the same cage.

Chickens and rabbits caged together is one of the famous typical anecdotes in ancient China, which was recorded in Sun Tzu's Art of War. Chickens and rabbits in the same cage in history is one of the famous mathematical problems in ancient China. About 1500 years ago, this interesting question was recorded in Sun Tzu's calculation.