РЕШИТЕ СРОЧНО НОМЕР 823 824 825

823 а) [latex] \frac{1}{3} * \frac{2}{7} = \frac{1*2}{3*7} = \frac{2}{21} [/latex] б) [latex] \frac{1}{2} * \frac{5}{6} = \frac{5}{12} [/latex] в) [latex] \frac{3}{4} * \frac{1}{4} = \frac{3}{16} [/latex] 824  а) [latex] \frac{8}{9} * \frac{3}{5} = \frac{8*3}{9*5} = \frac{8*1}{3*5} = \frac{8}{15}[/latex] б) [latex] \frac{9}{2} * \frac{2}{9} = \frac{9*2}{2*9} = \frac{1*1}{1*1} = 1 [/latex] в) [latex] \frac{8}{21} * \frac{7}{10} = \frac{8*7}{21*10} = \frac{4*1}{3*5} = \frac{4}{15}[/latex] 825 а) [latex] \frac{3}{7} * 2 = \frac{6}{7} [/latex] б) [latex] 3 * \frac{1}{6} = 1 * \frac{1}{2} = \frac{1}{2} [/latex] в) [latex] 9 * \frac{5}{6} = 3 * \frac{5}{2} = \frac{15}{2}[/latex] г) [latex] \frac{2}{5}* 15 = \frac{2}{1} * 3 = 6[/latex] д) [latex] \frac{1}{4}* 4 =\frac{1}{1} *1= 1[/latex] е) [latex] 5*\frac{1}{5}= 1 *\frac{1}{1} = 1[/latex]