Question

Найдите значения выражений.
-21 целая 2/7(-3,5a+1,4b+1,75c)-32b-40c=69a+3 целых 1/3(1,5a+0,6b+0,75c)

Answer 1

$-21 frac{2}{7} (-3,5a+1,4b+1,75c)-32b-40c=69a+3 frac{1}{3} (1,5a+0,6b+0,75c)$
$frac{149}{2} a- frac{149}{5} b- frac{149}{4} c-32b-40c=69a+5a+2b+ frac{25}{10} c$
$74,5a-29,8b-37,25c-32b-40c=69a+5a+2b+2,5c$
$74,5a-61,8b-77,25c=74a+2b+2,5c$
$74,5a-74a-61,8b-2b-77,25c-2,5c=0$
$0,5a-63,8b-79,75c=0$

Answer 2

Спасибо.

Answer 3

http://znanija.com/task/9729459