B.2: 3 + (-3 1/4), B.3: 2 + (-3 1/7)

**Решение:** **B.2:** \[3 + \left(-3\frac{1}{4}\right) = 3 - \frac{13}{4} = \frac{12}{4} - \frac{13}{4} = -\frac{1}{4}\] **B.3:** \[2 + \left(-3\frac{1}{7}\right) = 2 - \frac{22}{7} = \frac{14}{7} - \frac{22}{7} = -\frac{8}{7} = -1\frac{1}{7}\] **Ответ:** B.2: -1/4, B.3: -1 1/7