Question

решите оба пожалуйста

Answer 1

№1
$1) frac{7}{8}p *frac{4}{9}k= frac{7}{2}p* frac{1}{9}k= frac{7*p*k}{18}$
$2) frac{17}{12}x* frac{9}{51}y= frac{1}{4}x* frac{3}{3}y= frac{1}{4}xy$
$3) frac{21}{8}x*2y* frac{16}{7}z= frac{21}{8}x*y*frac{8}{7}*z=3xyz$
№2
$1) frac{5}{18}c + frac{7}{24}c+ frac{11}{30}c=( frac{5}{3} + frac{7}{4}+ frac{11}{5})* frac{1}{6} c= (frac{100+105+132}{60})frac{1}{6}c= frac{337}{60} * frac{1}{6}*c$$= frac{337}{360} c$
$2) frac{8}{13}m+ frac{5}{26}m+ frac{7}{39} m=(8+ frac{5}{2}+ frac{7}{3})* frac{1}{13}m=( frac{48+15+14}{6}) * frac{1}{13}m= frac{77}{6}*$$frac{1}{13}m= frac{77}{78}m$
$3) frac{39}{16}y+ frac{65}{20}y+ frac{11}{8}y=( frac{16}{2}+ 13+ frac{11}{2})* frac{1}{4}y= ( frac{16+26+11}{2}) *frac{1}{4}y= frac{53}{8}y$