a)
[tex]3 \frac{1}{2} \times \frac{5}{7} = \frac{7}{2} \times \frac{5}{7} = \frac{1}{2} \times \frac{5}{1} = \frac{5}{2} = 2 \frac{1}{2} [/tex]
b)
[tex]7 \frac{1}{2} \times 3 \frac{1}{15} = \frac{15}{2} \times \frac{46}{15} = \frac{1}{2} \times \frac{46}{1} = \frac{46}{2} = 23[/tex]
c)
[tex]1 \frac{4}{5} \times 1 \frac{2}{3} \times 1 \frac{1}{8} = \frac{9}{5} \times \frac{5}{3} \times \frac{9}{8} = \frac{3}{1} \times \frac{1}{1} \times \frac{9}{8} = \frac{27}{8} = 3 \frac{3}{8} [/tex]
d)
[tex]4 \frac{1}{2} \times 5 \frac{1}{3} \times 12 \frac{1}{2} = \frac{9}{2} \times \frac{16}{3} \times \frac{25}{2} = \frac{3}{1} \times \frac{8}{1} \times \frac{25}{2} = \frac{3}{1} \times \frac{4}{1} \times \frac{25}{1} = 12 \times 25 = 300[/tex]
Myślę że pomogłem ;)
Odpowiedź:
3 i 1/2 * 5/7 = 7/2 * 5/7 = 5/2 = 2 i 1/2
7 i 1/2 * 3 i 1/15 = 15/2 * 46/15 = 46/2 = 23
1 i 4/5 * 1 i 2/3 * 1 i 1/8 = 9/5 * 5/3 * 9/8 = 3 * 9/8 = 27/8 = 3 i 3/8
4 i 1/2 * 5 i 1/3 * 12 i 1/2 = 9/2 * 16/3 * 25/2 = 24 * 25/2 = 600/2 = 300