Question

Folosind proportii derivate,aflati x din:
a. x+1/x=7/6
b. x/x+2=7/9
c. x/8=x+1/9

Answer 1

a)  (x+1)/x = 7/6  ⇔    [(x+1)-x]/x = (7-6)/6      1/x = 1/6    x = 6
b) x/(x+2) = 7/9  ⇔  x/(x+2-x) = 7/(9-7)  ⇔  x/2 = 7/2  x = 7
c) x/8 =( x + 1)/9  ⇔  x/(x+1) = 8/9    x/(x+1-x) = 8/(9-8)  x/1 = 8/1   x = 8