Question

4)5целых 2/5*40/81*15/16=?
6)12целых6/7*2/25*7/18=?
8)3целых9/10*8/13*4целых1/6=?

Answer 1

$5frac{2}{5}* frac{40}{81} * frac{15}{16} = frac{27}{5}* frac{40}{81} * frac{15}{16} =frac{27*40*15}{5*81*16}= frac{10*3}{3*4}= frac{10}{4}= frac{5}{2}=2 frac{1}{2}$
$12 frac{6}{7}* frac{2}{25}* frac{7}{18}= frac{90}{7}* frac{2}{25}* frac{7}{18}= frac{90*2*7}{7*25*18}= frac{90}{225}= frac{18}{45}$
$3 frac{9}{10}* frac{8}{13}* 4 frac{1}{6}= frac{39}{10} * frac{8}{13}* frac{25}{6}= frac{39*8*25}{10*13*9}= frac{3*4*25}{5*9}= frac{4*5}{3} = frac{20}{3} = 6frac{2}{3}$