a)
[tex]3 \times 6 \frac{2}{3} = 3 \times \frac{20}{3} = \frac{3}{1} \times \frac{20}{3} = \frac{1}{1} \times \frac{20}{1} = \frac{20}{1} = 20[/tex]
b)
[tex]7 \times 2 \frac{1}{5} = \frac{7}{1} \times \frac{11}{5} = \frac{77}{5} = 15 \frac{2}{5} [/tex]
c)
[tex]1 \frac{5}{7} \times 3 = \frac{12}{7} \times \frac{3}{1} = \frac{36}{7} = 5 \frac{1}{7} [/tex]
d)
[tex]5 \frac{1}{3} \times 10 = \frac{16}{3} \times \frac{10}{1} = \frac{160}{3} = 53 \frac{1}{3} [/tex]
Myślę że pomogłem ;)
