[tex] \frac{1}{2} -\frac{2}{5} = \\ 2 \times \frac{11}{12} - \frac{4}{9} = \\ 9 \times \frac{5}{9} - 2 \times \frac{4}{5} = \\ 4 \times \frac{2}{11} - 2 \times \frac{2}{3} = \\ \frac{8}{7} - \frac{2}{3} = \\ 10 \times \frac{13}{15} - \frac{5}{6} = \\ 8 \times \frac{3}{8} - 7 \times \frac{5}{6} = \\ 7 \times \frac{1}{3} - 4 \times \frac{20}{21} = \\ \frac{3}{4} - \frac{2}{9} = \\ 11 \times \frac{1}{4} - \frac{5}{8} = \\ 15 \times \frac{1}{11} - 6 \times \frac{3}{4} = \\ 6 \times \frac{3}{7} - 5 \times \frac{4}{5} = \\ \frac{7}{12} - \frac{4}{15} = \\ 15 \times \frac{1}{2} - 4 \times \frac{3}{4} = \\ 24 \times \frac{5}{13} - 14 \times \frac{2}{3} = \\ 17 \times \frac{11}{13} - 12 \times \frac{3}{4} = [/tex]
Oblicz. Z obliczeniami i jak do tego doszło.
Kto mi odpowiada to dostanie 5 gwiazdek i serce. ​