Решите 12000:40*5-2700 520:13+9000:45 28907+12035-120*5 4200:(7:3)+1450:50 9000:100*(18+22) 20500-(5500+500*9)

Первый пример.

12 000 : 40 * 5 - 2700 = -1200;

12 000 / 40 = 300;

300 * 5 = 1500;

1500 - 2700 = -1200.

2-ой пример.

520 : 13 + 9000 : 45 = 240;

9000 / 45 = 200;

520 / 13 = 40;

40 + 200 = 240.

3-ий пример.

28 907 + 12 035 - 120 * 5 = 41 342;

120 * 5 = 600;

28 907 + 12 035 = 40 942;

40 942 - 600 = 40 342.

4-ый пример.

4200 : (7 : 3) + 1450 : 50 = 1855,01;

7 / 3 = 2,3;

4200 / 2,3 = 1826,01;

1450 / 50 = 29;

1826,01 + 29 = 1855,01.

5-ый пример. 

9000 : 100 * (18 + 22) = 3600;

18 + 22 = 40;

9000 / 100 = 90;

90 * 40 = 3600.

6-ой пример.

20 500 - (5500 + 500 * 9) = 10 500;

500 * 9 = 4500;

5500 + 4500 = 10 000;

20 500 - 10 000 = 10 500.