Question

Найти: (2а+3b):(4a-5b), если (17а-b):(7a+8b) = -5

Answer 1

(17a-b)/(7a+8b) = -5

17a - b = -35a - 40b

52a = -39b

4a = -3b

a = -0,75b

    (2a+3b)/(4a-5b) = (-1,5b+3b)/(-3b-5b) = 1,5b/(-8b) = -0,1875  

ответ: -0,1875