Question

Помогите срочно надо. Пожалуйста. Срочно надо.
( 7целых -2 целых 2/5 *1 целую 7/8) : 5 целых 5/8=

Answer 1

$( 7- 2frac{2}{5}*1 frac{7}{8}):5 frac{5}{8} = (7- frac{12}{5}*frac{15}{8}):5 frac{5}{8}=(7-frac{3}{1}*frac{3}{2}):5frac{5}{8} =(7-frac{9}{2}):5frac{5}{8}$ =
= $(7-frac{9}{2}):5frac{5}{8} = 2 frac{1}{2}: 5frac{5}{8}= frac{5}{2}: frac{45}{8} = frac{5}{2}* frac{8}{45}= frac{1}{1}* frac{4}{9}= frac{4}{9}$

Answer 2

спасибо большое

Answer 3

(7 - 2 2/5 * 1 7/8) : 5 5/8 = 4/9

1) 2 2/5 * 1 7/8 = 12/5 * 15/8 = (3*3)/(1*2) = 9/2 = 4 1/2
2) 7 - 4 1/2 = 6 2/2 - 4 1/2 = 2 1/2
3) 2 1/2 : 5 5/8 = 5/2 : 45/8 = 5/2 * 8/45 = (1*4)/(1*9) = 4/9