Question

вычислите: 1 1/3*3 1/4; 3/4*1 1/3; 2/11*1 5/6; 5 5/7*9/20

Answer 1

$1frac{1}{3} * 3frac{1}{4} = frac{4}{3} * frac{13}{4} = frac{4*13}{3*4} =$ $frac{13}{3} = 4 frac{1}{3}$

$frac{3}{4} * 1frac{1}{3} = frac{3}{4} * frac{4}{3} = frac{3*4}{4*3} =1$

$frac{2}{11} * 1frac{5}{6} = frac{2}{11}* frac{11}{6} = frac{2*11}{11*6} = frac{2}{6} = frac{1}{3}$

$5frac{5}{7} * frac{9}{20} = frac{40}{7} * frac{9}{20} = frac{40*9}{7*20} = frac{2*9}{7*1} = frac{18}{7} = 2 frac{4}{7}$