Question

найдите а/в,если 2а+7в/2в+7а=-4

Answer 1

1) 2a + 7b / 2b + 7a = - 4
2a + 7b = - 4( 2b + 7a )
2a + 7b = - 8b - 28a
30a = - 15b
2a = - b
b = - 2a
2) a / b = a / ( - 2a ) = - 1/2 = - 0,5
Ответ ( - 0,5 )