According to the title, one crab has 8 legs and two crabs 16 legs. Number of crab legs = number of crabs × 8.

And1× 8 = 8,2? × 8 = 16, which is obviously true.

So, the number of legs of n crabs is n? × 8 = 8n. That is, n crabs have 8n legs.

Extended data:

equation

An equation refers to an equation containing unknowns. It is an equation that represents the equal relationship between two mathematical expressions (such as two numbers, functions, quantities and operations), and the value of the unknown quantity that makes the equation hold is called "solution" or "root". The process of finding the solution of the equation is called "solving the equation".

By solving the equation, we can avoid the difficulty of reverse thinking and directly list the equations with the quantity to be solved. There are many forms of equations, such as one-dimensional linear equation, two-dimensional linear equation, one-dimensional quadratic equation and so on. , can also be combined into equations to solve multiple unknowns.