[tex]1. \: \: 45\% \div 0.25 \times 2 \frac{1}{4} = \frac{45}{100} \div \frac{25}{100} \times \frac{9}{4} = \frac{9}{20} \div \frac{1}{4} \times \frac{9}{4} = \frac{9}{20} \times \frac{4}{1} \times \frac{9}{4} = \frac{9}{20} \times \frac{1}{1} \times \frac{9}{1} = \frac{81}{20} = 4 \frac{1}{20} \: \: atau \: \: 4.05 \\ [/tex]
[tex]2. \: \: \frac{1}{2} \times 2.25 \div \frac{3}{4} = \frac{1}{2} \times \frac{225}{100} \div \frac{3}{4} = \frac{1}{2} \times \frac{9}{4} \times \frac{4}{3} = \frac{1}{2} \times \frac{3}{1} \times \frac{1}{1} = \frac{3}{2} = 1 \frac{1}{2} \: \: atau \: \: 1.5 \\ [/tex]
[tex]3. \: \: 15 \% \times 3.5 \div \frac{1}{4} = \frac{15}{100} \times \frac{35}{10} \div \frac{1}{4} = \frac{3}{20} \times \frac{7}{2} \times \frac{4}{1} = = \frac{3}{5} \times \frac{7}{2} \times \frac{1}{1} = \frac{21}{10} = 2 \frac{1}{10} \: \: atau \: 2.1 \\ [/tex]
[tex]4. \: \: 1 \frac{4}{5} \div 0.25 \times 2 \frac{1}{5} = \frac{9}{5} \div \frac{25}{100} \times \frac{11}{5} = \frac{9}{5} \div \frac{1}{4} \times \frac{11}{5} = \frac{9}{5} \times \frac{4}{1} \times \frac{11}{5} = \frac{396}{25} = 15 \frac{21}{25} \: \: atau \: 15.84 \\ [/tex]
[tex]5. \: \: 0.75 \times 0.2 \div 2 \frac{1}{2} = \frac{75}{100} \times \frac{2}{10} \div \frac{5}{2} = \frac{3}{4} \times \frac{1}{5} \times \frac{2}{5} = \frac{3}{2} \times \frac{1}{5} \times \frac{1}{5} = \frac{3}{50} \: \: atau \: \: 0.06 \\ [/tex]
