Решите уравнение: 1)-7x + 4x - 8x = -9,9; 3) 1/8x -2/3x +1/2x = -5/18; 2) 0,64 - 1.94 - 0.54 = 0.54. 4) -9 5/27b +2 3/b+1 5/27b =1 7/27

Ответ:

1. -7x + 4x - 8x = -9.9

   -11x = -9.9

   x = -9.9 / -11

   x = 0.9

2. 0.6y - 1.9y - 0.5y = 0.54

   -1.8y = 0.54

   y = 0.54 / -1.8

   y = -0.3

3. 1/8x - 2/3x + 1/2x = -5/18

   (3/24)x - (16/24)x + (12/24)x = -5/18

   (-1/24)x = -5/18

   x = (-5/18) / (-1/24)

   x = (-5/18) * (-24/1)

   x = 120/18

   x = 20/3

   x = 6 2/3

4. -9 5/27b + 2 3/27b + 1 5/27b = 1 7/27

   (-9 - 5/27 + 2 + 3/27 + 1 + 5/27)b = 1 7/27

   (-6 + 3/27)b = 1 7/27

   -6 b + 1/9b = 1 + 7/27

   -53/9b = 34/27

   b = (34/27) / (-53/9)

   b = (34/27) * (-9/53)

   b = -306/1431

   b = -34/159

Ответ: x = 0.9, y = -0.3, x = 6 2/3, b = -34/159