Question

Решите:
а)(2/9+1 2/3)*3
б)5/12*2 3/7+5/12*3 4/7
в)(5 2/9*3 1/8+3 1/3)*3-7 2/3
г)(5 2/9*1,4+3 1/3)*3-7 2/3

Answer 1

а) $(frac{2}{9}+1 frac{2}{3})*3= frac{2}{9}*frac{3}{1} +frac{5}{3}*frac{3}{1}=frac{2}{3}+frac{5}{1}=5frac{2}{3}$

б) $frac{5}{12} *2 frac{3}{7} + frac{5}{12} *3 frac{4}{7} = frac{5}{12} *6= frac{5}{2} =2 frac{1}{2}$

в) $(5 frac{2}{9} *3 frac{1}{8} +3 frac{1}{3} )*3-7 frac{2}{3} =frac{47}{9} * frac{25}{8} *3+ frac{10}{3}*3-7 frac{2}{3}= \ = frac{1175}{24} +10-7frac{2}{3}=48frac{23}{24} + 2 frac{1}{3} =51 frac{7}{24}$

г) $(5 frac{2}{9} *1,4+3 frac{1}{3} )*3-7 frac{2}{3} = frac{47}{9} * frac{7}{5} *3+ frac{10}{3} *3-7 frac{2}{3} = \ =21 frac{14}{15} +2 frac{5}{15} =24 frac{4}{15}$