Решите уравнения x+1800:2=1100; (500+400):y=30; c(2006)=2400; 1800:x-8=80; (2000+a)-500=3000; 1200:(y-600)=400

Найдем х.

1) x + 1800/2 = 1100; 

x + 900 = 1 100;

x = 1 100 - 900;

x = 200.

2) (500 + 400)/y = 30; 

30 * y = 500 + 400;

30 * y = 900;

3 * y = 90;

y = 90/3;

y = 30.

3) c * (200 * 6) = 2400; 

c = 2 400/(200 * 6); 

c = 2 400/1200;

c = 2.

4) 1800/x - 8 = 80; 

1800/x = 88;

88 * x = 1800;

x = 1800/88;

x = 900/44;

x = 450/22.

5) (2000 + a) - 500 = 3000; 

2 000 + a - 500 = 3 000;

1 500 + a = 3 000;

a = 3 000 - 1 500;

a = 1 500.

6) 1200/(y - 600) = 400; 

3/(y - 600) = 1; 

y - 600 = 3; 

y = 3 + 600; 

y = 603.