Calculate the values of the given expressions:

Solution:

• \( -4.8 : (1.21 + 0.39) = -4.8 : 1.6 = -3 \)
• \( 5.4 : (1.42 - 4.42) = 5.4 : (-3) = -1.8 \)
• \( 7.7 : (0.97 + 4.53) = 7.7 : 5.5 = 1.4 \)
• \( 5.5 : (2.62 + 1.78) = 5.5 : 4.4 = 1.25 \)
• \( -7.2 : (0.73 + 1.07) = -7.2 : 1.8 = -4 \)
• \( 1 - 2(5 + 3x) = 15 \)
  \( 1 - 10 - 6x = 15 \)
  \( -9 - 6x = 15 \)
  \( -6x = 15 + 9 \)
  \( -6x = 24 \)
  \( x = -4 \)
• \( 8 - 5(8 + 3x) = 13 \)
  \( 8 - 40 - 15x = 13 \)
  \( -32 - 15x = 13 \)
  \( -15x = 13 + 32 \)
  \( -15x = 45 \)
  \( x = -3 \)
• \( 2 - 3(7 + 2x) = 11 \)
  \( 2 - 21 - 6x = 11 \)
  \( -19 - 6x = 11 \)
  \( -6x = 11 + 19 \)
  \( -6x = 30 \)
  \( x = -5 \)
• \( 2 - 3(2 + 3x) = 14 \)
  \( 2 - 6 - 9x = 14 \)
  \( -4 - 9x = 14 \)
  \( -9x = 14 + 4 \)
  \( -9x = 18 \)
  \( x = -2 \)

Ответ: -3; -1.8; 1.4; 1.25; -4; x = -4; x = -3; x = -5; x = -2.