Question

24. Folosind proporţii derivate, aflați x din:
a) x+1 /x=7/6
b) x/x+2=7/9
c) x/8=x+1/9​

Answer 1

Răspuns:

a) (x+1) /x=7/6

7x=6(x+1)

7x=6x+1

7x-6x=1=>x=1

b) x/(x+2)=7/9

9x=7(x+2)

9x=7x+14

9x-7x=14

2x=14=>x=14:2=>x=7

c) x/8=(x+1)/9​

9x=8(x+1)

9x=8x+8

9x-8x=8=>x=8