2000-1111=999

2087-1201=886

2071+527=2598

2834-957=1877

3001+619=3620

2600-799=1801

1) х + 1111 = 2000;

х = 2000 - 1111

х = 889

2)1201 + b = 2087;

b = 2087 - 1201

b = 886

3)m - 527 = 2071:

m = 2071 + 527

m = 2598

4)2834 - а = 957;

- а = 957 - 2834

- а = - 1877

а = 1877

5)х - 619 = 3001;

х = 3001 + 619

х = 3620

6) 2600 - n = 799;

- n = 799 - 2600

- n = - 1801

n = 1801