1. Znajdź liczbę której 1 i 1/5 to tyle co 4/9 sumy liczb 2 i 1/2  i  3 i 4/5   2. Oblicz 7/12 różnicy liczb 5 i 4/7   i   2 i 1/4   3. Do sumy liczb 15 i 1/6   i   9 i 7/8 dodaj różnice   POMOCY!!!!!!!!!!!!

1. [latex]frac{4}{9}cdot(2frac{1}{2}+3frac{4}{5})=frac{4}{9}cdot(2frac{5}{10}+3frac{8}{10})=frac{4}{9}cdot6frac{3}{10}=frac{4}{9}cdotfrac{63}{10}=frac{28}{10}=2frac{4}{5}[/latex] [latex]1frac{1}{5}-2frac{4}{5}\1-x\x=2frac{4}{5}:1frac{1}{5}\x=frac{14}{5}:frac{6}{5}\x=frac{14}{5}cdotfrac{5}{6}\x=frac{14}{6}=2frac{1}{3}[/latex]   2. [latex]frac{7}{12}cdot(5frac{4}{7}-2frac{1}{4})=frac{7}{12}cdot(5frac{16}{28}-2frac{7}{28})=frac{7}{12}cdot3frac{9}{28}=frac{7}{12}cdotfrac{93}{28}=frac{93}{48}=1frac{45}{48}=1frac{15}{16}[/latex]   3. [latex](15frac{1}{6}+9frac{7}{8})+(15frac{1}{6}-9frac{7}{8})=(15frac{4}{24}+9frac{21}{24})+(15frac{4}{24}-9frac{21}{24})=25frac{1}{24}+5frac{7}{24}=30frac{8}{24}=30frac{1}{3}[/latex]   Pozdrawiam.