The ratio of the distance on the map to the actual distance is called the scale. There are two scales: (1) numerical scale 1: 300 or one third of 300; (2) Line segment scale

2, the significance of positive proportion:

Two related quantities, one of which changes and the other changes. If the ratio (i.e. quotient) of the corresponding two quantities (x, y) is fixed, these two quantities are called proportional quantities, and the relationship between them is called proportional relationship. I will use the form of division below, but it's not true, just for convenience. Note: the scale is generally decimal, that is, one of the numerical scales).

Y/x=k (ok)

3, the meaning of inverse proportion:

Two related quantities, one of which changes and the other changes. If the product of two corresponding quantities (x, y) is certain (note that it is a product), these two quantities are called inverse proportional quantities, and their relationship is called inverse proportional relationship. Example: expressed as x*y=k (sure) by letter formula {k is only the result of the example, and the two results are irrelevant}