2.x = 1x = 2 1x = 0. 15x = 3。

3. (1) is directly proportional (2) is inversely proportional (3) is directly proportional (4) is directly proportional.

4. Analysis: First, according to the scale of 1: 2000000, get the actual distance between the two cities, and then get the distance on the map with the scale of 1: 5000000. Solution: The actual distance between the two cities is Xcm. 1:2000000 = 5.5: xx =11000000 Let the distance on this road map be Ycm. 1:5000000 = 1 1000000Y = 2.2

5. Solution: Let's arrange X columns. 20X=25*24 X=30