1. Вычислите:
a) $$14.6 \cdot 2.5 - 5.75$$
- $$14.6 \cdot 2.5 = 36.5$$
- $$36.5 - 5.75 = 30.75$$
Ответ: 30.75
б) $$6\frac{3}{4} + 3\frac{5}{6}$$
- $$6\frac{3}{4} + 3\frac{5}{6} = 6\frac{9}{12} + 3\frac{10}{12}= 9\frac{19}{12} = 10\frac{7}{12}$$
Ответ: $$10\frac{7}{12}$$
в) $$3\frac{1}{3} \cdot 21$$
- $$3\frac{1}{3} \cdot 21 = \frac{10}{3} \cdot 21 = \frac{10 \cdot 21}{3} = \frac{10 \cdot 7 \cdot 3}{3} = 10 \cdot 7 = 70$$
Ответ: 70
г) $$5\frac{1}{3} : 1\frac{11}{33}$$
- $$5\frac{1}{3} : 1\frac{11}{33} = \frac{16}{3} : \frac{44}{33} = \frac{16}{3} \cdot \frac{33}{44} = \frac{16 \cdot 33}{3 \cdot 44} = \frac{16 \cdot 11 \cdot 3}{3 \cdot 11 \cdot 4} = \frac{16}{4} = 4$$
Ответ: 4