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Third grade math problem: Xiaohong lives on the fifth floor and goes up and down the stairs four times a day. How many steps does she take in a day? How to answer?
Generally speaking, there are 1 1+ 12 steps on the first floor, and there are 23 steps (guess, I'm talking about ideas).

Solution: suppose a floor has x steps,

Live on the fifth floor

There are 4x steps in the middle (excluding those on the first floor)

Up and down four times a day

∴: There are 4 * 4 steps,

A: One day * * * walked 16x.

If X has a number to bring, bring it in.

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