a. 1 / a △ 2 / 7 = 1 / b × 3 / 5 = 1 / C, the following correct is () 1. A ＞ B ＞ C 2. A ＞ C ＞ B 3. B ＞ C ＞ a

a. 1 / a △ 2 / 7 = 1 / b × 3 / 5 = 1 / C, the following correct is () 1. A ＞ B ＞ C 2. A ＞ C ＞ B 3. B ＞ C ＞ a

2.a＞c＞b

It is known that a and B are both non-zero natural numbers, and a + B = 90. The greatest possible product of a and B is () fill in the blanks

A+B＝90,AB≤（A+B）^2/4=45^2=2025

It is known that a and B are non-zero natural numbers, and a + B = 200. The minimum product of a and B is () and the maximum is ()

The minimum is 199 and the maximum is 10000
Because a + B = 200, the minimum value of a * B is to make the difference between a and B as large as possible, and the maximum difference is 198, that is, a and B are 1 and 199. The maximum value is to make the difference between a and B as small as possible, and the minimum difference is 0, that is, a and B are 100 and 100