А)x+2/3=1/6 б)3/4-1/2x=3/8 в)3/10x-1/5=1 7/20

А) x + 2/3 = 1/6;

х = 1/6 - 2/3 = 1/6 - 2 * 2/6 = 1/6 - 4/6 = (1 - 4)/6 = -3/6 = -1/2;

Ответ: -1/2.

б) 3/4 - 1/2 * x = 3/8;

3/4 - 3/8 = 1/2 * х;

6/8 - 3/8 = 1/2 * х;

3/8 = 1/2 * х;

х = 3/8 * 2 = 3/4;

в) 3/10 * x - 1/5 = 1 7/20;

3/10 * x = 27/20 + 1/5;

3/10 * x = 27/20 + 4/20;

3/10 * x = 31/20;

х = 31/20 * 10/3 = 31/6.