Question

va rog frumos fac orice dau si coroana

Answer 1

$13)6\frac{13}{18}*11\frac{5}{11}=\frac{6*18+3}{18}*\frac{11*11+5}{11}=\frac{121}{18}*\frac{126}{11}=7*11=77$ ∈ |N

$14)1\frac{1}{2}*1\frac{1}{3}*1\frac{1}{4}* ...*1\frac{1}{2013}=\frac{3}{2}*\frac{4}{3}*\frac{5}{4}*\frac{6}{5}*...*\frac{2012}{2011} *\frac{2013}{2012} *\frac{2014}{2013}=\frac{1}{2}*2014=1007$ ∈ |N