Solve the equations: -3.2 * 0.4 + 2.6 * (-0.5) = 5.2 * (-0.8) - (-1.5) * (-3.4) = (7.6 - 20) * (-3.14 + 5.24) = (-1 3/25) * 2 1/7 + (-2 1/9) * (-27/190) =

Решение:

• Первое уравнение:
  -3.2 * 0.4 = -1.28
  2.6 * (-0.5) = -1.3
  -1.28 + (-1.3) = -2.58
• Второе уравнение:
  5.2 * (-0.8) = -4.16
  (-1.5) * (-3.4) = 5.1
  -4.16 - 5.1 = -9.26
• Третье уравнение:
  7.6 - 20 = -12.4
  -3.14 + 5.24 = 2.1
  -12.4 * 2.1 = -26.04
• Четвертое уравнение:
  -1 3/25 = -28/25
  2 1/7 = 15/7
  -28/25 * 15/7 = - (28/7) * (15/25) = -4 * (3/5) = -12/5
  -2 1/9 = -19/9
  -19/9 * (-27/190) = (19/9) * (27/190) = (19 * 27) / (9 * 190) = (1 * 3) / (1 * 10) = 3/10
  -12/5 + 3/10 = -24/10 + 3/10 = -21/10 = -2.1

Ответ: -2.58, -9.26, -26.04, -2.1