Tolong bantu ya kak....

[tex]1. \: \: 0.45 = \frac{45}{100} = \frac{9}{20} \\ 2. \: \: \frac{5}{6} + \frac{2}{7} - \frac{3}{5} \\ \frac{175}{210} + \frac{60}{210} - \frac{126}{210} \\ \frac{109}{210} \\ 3. \: \: 46.2 \div 4.2 \times \frac{1}{8} \\ 11 \times \frac{1}{8} = 1.375 = \frac{1375}{1000} \\ \frac{55}{40} = \frac{11}{8} \\ saya \: tidak \: tau \: nomer \: 4. \\ 5. \: \: \frac{20 + 30 + 40 + 40 + 50 + 60 + 70}{7} \\ \frac{310}{7} = 44.28[/tex]