Решите уравнение: a) 7,2 (6,2 x) = 2,2; б) 5+ (a 25) = -4; 5. г) (х+3) 17 = -20; д) (106) + 23,5 = -40,4; e) (m+-1=0.8.

Ответ:

1. a) 7.2 - (6.2 - x) = 2.2
   6.2 - x = 7.2 - 2.2
   6.2 - x = 5
   x = 6.2 - 5
   x = 1.2
2. б) 5 + (a - 25) = -4
   a - 25 = -4 - 5
   a - 25 = -9
   a = -9 + 25
   a = 16
3. г) (x + 3) - 17 = -20
   x + 3 = -20 + 17
   x + 3 = -3
   x = -3 - 3
   x = -6
4. д) (10 - b) + 23.5 = -40.4
   10 - b = -40.4 - 23.5
   10 - b = -63.9
   b = 10 + 63.9
   b = 73.9
5. e) \[\frac{5}{16} = m + \frac{8}{15} = 0.8\] \[m + \frac{8}{15} = \frac{5}{16} - 0.8\] \[m + \frac{8}{15} = \frac{5}{16} - \frac{4}{5}\] \[m = \frac{5}{16} - \frac{4}{5} - \frac{8}{15}\] \[m = \frac{5*75 - 4*240 - 8*80}{1200}\] \[m = \frac{375 - 960 - 640}{1200}\] \[m = \frac{-1225}{1200} = -\frac{49}{48}\]

Ответ: