Question

математика 5 класс дроби помогите дам 20 баллов пжжжжжжжж

Answer 1

$\frac{12}{26} / \frac{8}{13} = \frac{12}{26}*\frac{13}{8} =\frac{3}{2} *\frac{1}{2} =\frac{3}{4} \\\\\frac{9}{42} / \frac{12}{21} = \frac{9}{42} *\frac{21}{12} =\frac{3}{2} *\frac{1}{4} =\frac{3}{8} \\\\\frac{17}{50} /\frac{18}{51} = \frac{17}{50} *\frac{51}{18} =\frac{17}{50} *\frac{17}{6} =\frac{289}{300} \\\\\\ frac{3}{10} / \frac{27}{30} =\frac{3}{10} *\frac{30}{27} =\frac{3}{9}=\frac{1}{3}\\\\4\frac{4}{5 }+4\frac{1}{5} = (4+4)+(\frac{4}{5} +\frac{1}{5} )=8+1=9$$4\frac{1}{5} + 3\frac{4}{5} = ( 4+3)+(\frac{1}{5} + \frac{4}{5} )=7+1=8\\\\4\frac{1}{5} +13\frac{2}{5} = ( 4+13)+(\frac{1}{5} +\frac{2}{5} )=17+\frac{3}{5} =17\frac{3}{5} \\\\4\frac{1}{5}+3\frac{3}{5} =(4+3)+(\frac{1}{5}+\frac{3}{5})=7+\frac{4}{5} =7\frac{4}{5}\\\\4\frac{1}{5}+5\frac{1}{5} =(4+5)+(\frac{1}{5}+\frac{1}{5})=9+\frac{2}{5} = 9\frac{2}{5} \\\\4\frac{1}{5}+45\frac{1}{5}=(4+45)+(\frac{1}{5}+\frac{1}{5})=49+\frac{2}{5}=49\frac{2}{5}$$4\frac{1}{5}+12\frac{4}{5} = (4+12)+(\frac{1}{5} + \frac{4}{5} )=16+1=17\\\\4\frac{1}{5}+31\frac{3}{5} = (4+31)+(\frac{1}{5} +\frac{3}{5})=35+\frac{4}{5} =35\frac{4}{5}$