50. а) Вычислите.

Решение:

• \( |-7|+|-14| = 7+14=21 \)
• \( \frac{3}{4} + (-\frac{3}{4}) = \frac{3}{4} - \frac{3}{4} = 0 \)
• \( |-20| + \frac{5}{6} = 20 + \frac{5}{6} = 20\frac{5}{6} \)
• \( |1.7| - \frac{1}{5} = 1.7 - 0.2 = 1.5 \)
• \( -6\frac{1}{2} + 2\frac{3}{4} = -6.5 + 2.75 = -3.75 \)
• \( 24,4 - |-12| - |-3| = 24.4 - 12 - 3 = 24.4 - 15 = 9.4 \)
• \( |-3,1| \cdot |-4,1| = 3.1 \cdot 4.1 = 12.71 \)
• \( |-0,6| \cdot |3\frac{1}{3}| = 0.6 \cdot \frac{10}{3} = \frac{6}{10} \cdot \frac{10}{3} = \frac{6}{3} = 2 \)
• \( |-0,45| : |-0,9| = 0.45 : 0.9 = 0.5 \)
• \( |-12| : |-3| = 12 : 3 = 4 \)
• \( |-5,4| + |1,8| : |0,4| = 5.4 + 1.8 : 0.4 = 5.4 + 4.5 = 9.9 \)
• \( 13,2 \cdot (5 - |-2|) = 13.2 \cdot (5 - 2) = 13.2 \cdot 3 = 39.6 \)
• \( 7\frac{1}{2} : (|-7| + |-8|) = 7.5 : (7 + 8) = 7.5 : 15 = 0.5 \)

Ответ: 21; 0; 20⅛; 1,5; -3,75; 9,4; 12,71; 2; 0,5; 4; 9,9; 39,6; 0,5