Question

Folosind proportii derivate,schimband in acelasi fel fiecare raport,aflati x din proportiile: x+4 supra 4=9 supra 7 ; 3/x-3=2/5; x-5/5=3/7

Answer 1

Răspuns:

Explicație pas cu pas:

a)(x+4)/4=9/7=(x+4-4)/4=(9-7)/7 =x/4=2/7       ⇒x=4×2/7=8/7

b)3/(x-3)=2/5=3/(x-3+3)=2/(5+2)=3/x=2/7    ⇒x=21/2

c)(x-5)/5=3/7 =(x-5+5)/5=(3+7)/7=x/5=10/7    ⇒x=50/7