3 5 1 в) a + b – a – b; 4 6 8 3

Решение:

• в) \[ \frac{3}{4}a + \frac{5}{6}b - \frac{1}{8}a - \frac{1}{3}b = (\frac{3}{4}a - \frac{1}{8}a) + (\frac{5}{6}b - \frac{1}{3}b) = (\frac{6}{8}a - \frac{1}{8}a) + (\frac{5}{6}b - \frac{2}{6}b) = \frac{5}{8}a + \frac{3}{6}b = \frac{5}{8}a + \frac{1}{2}b \]