Example 2: 500,000,600,000. 900,000 (2) 350,000,250,000

Example 3: 0.5X+0.7y=35 x+0.4y=40, x=28 y=30.

Evaluation:1:x+y = 681.12x+1.13 = 8.42.

2:x+y = 4200 1.08 x+ 1. 1 1Y = 4200 * 1. 1

3:x+y = 100 0.2x+0. 12y = 100 * 0. 15