A) 4х=75-х б) 8х-25=40-5х в)6(х-12)=8х-2 г)3,1+5у=7(у-4,1) срочно даю 50...

Ответ:

1) 5/6х + 8 = 1/4х - 6;

5/6х - 1/4х = -6 - 8;

10/12х - 3/12х = -14;

7/12х = -14;

х = -14 * 12/7;

х = -24.

2) 1,5(2х + 5) + х = 3(0,5х - 7) + 3,5;

3х + 7,5 + х = 1,5х - 21 + 3,5;

3х + х - 1,5х = -21 + 3,5 - 7,5;

2,5х = -25;

х = -25 : 2,5;

х = -10.

3) 11/18х - 2/9 = 5/12х + 1(1/3);

11/18х - 5/12х = 1(1/3) + 2/9;

22/36х - 15/36х = 1(3/9) + 2/9;

7/36х = 1(5/9);

х = 14/9 * 36/7.

4) 2/3 * (4(1/2)х - 3/5) - 5/7 * (7/15х - 7/9) = -1(32/45).

2/3*(9/2х - 3/5) - 1/3х + 5/9 = -1(32/45);

3х - 2/5 - 1/3х = -1(32/45) - 5/9;

2(2/3)х = -1(32/45) - 25/45 + 18/45;

2(2/3)х = -1(13/15);

х = -28/15 * 3/8;

х = -0,7.

Пошаговое объяснение: