№1 3 3 1 1) 2:예+예: 2+12:6+6:12 1 2 1 2) 6-8-3-50+2㎡ 412 1 2 2 1 5 22-48-33:18 +51236 1 1 5 4) 13:10 + 16:111 + 19:25

№1

1. \[2:\frac{3}{5} + \frac{3}{5}:2 + 1\frac{1}{2}:6 + 6:1\frac{1}{2} = 2 \cdot \frac{5}{3} + \frac{3}{5} \cdot \frac{1}{2} + \frac{3}{2} \cdot \frac{1}{6} + 6 \cdot \frac{2}{3} = \frac{10}{3} + \frac{3}{10} + \frac{3}{12} + \frac{12}{3} = \frac{10}{3} + \frac{3}{10} + \frac{1}{4} + 4 = \frac{10 \cdot 20 + 3 \cdot 6 + 1 \cdot 15 + 4 \cdot 60}{60} = \frac{200 + 18 + 15 + 240}{60} = \frac{473}{60} = 7\frac{53}{60}\]
2. \[6\frac{1}{4} \cdot 8 - 3\frac{2}{3} \cdot 5\frac{1}{2} + 2\frac{2}{5} \cdot 4\frac{7}{12} = \frac{25}{4} \cdot 8 - \frac{11}{3} \cdot \frac{11}{2} + \frac{12}{5} \cdot \frac{55}{12} = 50 - \frac{121}{6} + 11 = 61 - \frac{121}{6} = \frac{366 - 121}{6} = \frac{245}{6} = 40\frac{5}{6}\]
3. \[2\frac{1}{2} \cdot 48 - 3\frac{2}{3} : \frac{1}{18} + 5\frac{5}{12} : \frac{7}{36} = \frac{5}{2} \cdot 48 - \frac{11}{3} \cdot 18 + \frac{65}{12} \cdot \frac{36}{7} = 5 \cdot 24 - 11 \cdot 6 + \frac{65 \cdot 3}{7} = 120 - 66 + \frac{195}{7} = 54 + \frac{195}{7} = \frac{54 \cdot 7 + 195}{7} = \frac{378 + 195}{7} = \frac{573}{7} = 81\frac{6}{7}\]
4. \[13\frac{1}{2} : \frac{1}{3} + 16\frac{1}{2} \cdot 1\frac{5}{11} + 19\frac{1}{4} : \frac{4}{25} = \frac{27}{2} \cdot 3 + \frac{33}{2} \cdot \frac{16}{11} + \frac{77}{4} \cdot \frac{25}{4} = \frac{81}{2} + \frac{3 \cdot 8}{1} + \frac{1925}{16} = \frac{81}{2} + 24 + \frac{1925}{16} = \frac{81 \cdot 8 + 24 \cdot 16 + 1925}{16} = \frac{648 + 384 + 1925}{16} = \frac{2957}{16} = 184\frac{13}{16}\]