The foot of Jinyun Mountain is 80 meters above sea level, the top of the mountain is 680 meters above sea level, and the temperature at point B is 24.6 degrees. What's the temperature at a?

According to the meaning of the question, point A is 28.2 degrees.

(2) Problem solving ideas:

As the altitude rises 1000 meters, the temperature drops by 6 degrees Celsius. Then the temperature drops by 0.6 degrees Celsius every time the altitude rises 100 meters.

So the altitude difference between AB and AB is 600 meters, and the temperature drops by 0.6×6=3.6 (degrees).

A is at the foot of the mountain and B is at the top of the mountain. The temperature of A is higher than that of B, so the temperature of A is: 24.6+3.6=28.2 (degrees).

③ The key to solve the problem: Every time the altitude rises 1000m, the temperature drops by 6 degrees Celsius.