Номер 405 и 404 зарание спасибо

404.1) 2/7 2) 3 · 5²=3 · 25 =75 3) [latex] \frac{3*7}{11*13} = \frac{21}{143} [/latex] 4) 2²=4 5) [latex] \frac{3*11}{14} = \frac{33}{14} = 2 \frac{5}{14} [/latex] 6)[latex] \frac{ 2^{2} }{3} = \frac{4}{3} = 1 \frac{1}{3} [/latex] 7) [latex] \frac{13}{7} = 1 \frac{6}{7} [/latex] 8) [latex] \frac{13}{5} = 2 \frac{3}{5} = 2,6[/latex] 9) [latex] \frac{7}{23} [/latex] 405 1) [latex] \frac{10*(12+6)}{9*30} = \frac{10*18}{9*30} = \frac{2}{3} [/latex] 2) [latex] \frac{19*(4+9)}{38*26} = \frac{19*13}{38*26} = \frac{1}{4} [/latex] 3) [latex] \frac{17*(8-3)}{17*6} = \frac{17*5}{17*6} = \frac{5}{6} [/latex] 4) [latex] \frac{8*(5+2)}{28*6} = \frac{8*7}{28*6} = \frac{1}{3} [/latex] 5) [latex] \frac{16*(28-3)}{16*20} = \frac{16*25}{16*20} = \frac{25}{20} = 1 \frac{1}{4} [/latex] 6) [latex] \frac{9*(a+b)}{27c} = \frac{a+b}{3c} [/latex]