[tex]a) \: \frac{4}{5} \times \frac{15}{8} = \frac{3}{2} [/tex]
[tex]b) \: \frac{7}{10} \times \frac{20}{21} = \frac{2}{3} [/tex]
[tex]c) \frac{32}{48} \times \frac{16}{32} = \frac{1}{3} [/tex]
[tex]d) \: \frac{11}{12} \times \frac{24}{33} = \frac{2}{3} [/tex]
[tex]e) \frac{33}{44} \times \frac{77}{88} \times \frac{55}{22} = \frac{3 \times 7 \times 5}{4 \times 8 \times 2} = \frac{105}{64} [/tex]
[tex]f) \frac{1313}{3131} \times \frac{31}{13} = \frac{101}{101} = 1[/tex]
