Question

$15frac{6}{7} -12 frac{6}{7}$·($frac{1}{10} + frac{1}{15}$)
вычислить.

Answer 1

1) 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6 
2) 12 6/7 * 1/6 = 90/7 * 1/6 = 90/42 = 45/21 = 2 3/21 
3) 15 6/7 - 2 3/21 = 15 18/21 - 2 3/21 = 13 15/21 
ОТВЕТ 13 целых 15/21 

Answer 2

$15 frac{6}{7} -12 frac{6}{7} *( frac{1}{10} + frac{1}{15} )= \ 1) frac{1}{10} + frac{1}{15} = frac{3}{30} + frac{2}{30} = frac{5}{30} = frac{1}{6} \ 2)12 frac{6}{7} * frac{1}{6} = frac{90}{7*6} = frac{15}{7} =2 frac{1}{7} \ 3)15 frac{6}{7} -2 frac{1}{7} =13 frac{5}{7}$