Urgent! ! Urgent! ! Urgent! ! Application problems of mathematical inequality (group) in junior one.

1. Let 9 consecutive odd numbers be X-7, X-5, X-3, X- 1, X+ 1, X+3, X+5, X+7 and X+9.

Gaining inequality 2000

Get 2000

Get 22 1.2.

Must be an integer, then X=222,

Then nine consecutive odd numbers are 2 15, 2 17, 2 19, 22 1, 223, 225, 227, 229, 23 1.

2. Set the price of X yuan, and add up the ***T terms to get the inequality.

0.8T & lt=X( 1-5%)T

Get X & gt=0.842.

So the price is at least 0.85 yuan.

3. The original total output value was 100A, and now the total output value of production personnel is (100-x)1.2a..

The inequality of the total output value of service personnel is 3.5AX.

( 100-X) 1.2A & gt； = 100A，x < = 16.7

3.5AX & gt=0.5* 100A，x >； = 14.3

On the whole, X= 15 or 16.

The number of service personnel is 15 or 16.