Question

5a-2a+7b+9b-b при a=10 b=100​

Answer 1

5а-2а+7б+9б-б = 3а + 15б = 3(а + 5б) = 3 ( 10 + 500) = 1530

Answer 2

Так...

5*10-2*10+7*100+9*100-100=

1. 5 * 10=50

2. 2*10 = 20

3. 7*100 = 700

4. 9*100 = 900

5. 50 - 20 = 30

6. 30 + 700 = 730

7. 730 + 900 = 1.630

8. 1630 - 100 = 1530

Ответ: 1530