Question

Rezolvati in Q ecuatia 3[0,2(7)x-0,4]=1,(3)x. Dau coroana

Answer 1

3(25x/90-4/10)=12x/9
75x/90-12/10=12x/9 Aducem la acelasi numitor adica 90 12/10 o amplificãm cu 9 si 12x/10 o amplificãm cu 10
75x-108=120x
75x-120x=108
-45x=108
x=108:(-45)
x=-2,4

Answer 2

3[(27-2)/90-4/10]=(4/3)*x
 3 [25/90-36/90]=(4/3)*x

3 *(-11/90)=(4/3)*x

(4/3)*x=3 *(-11/90)
(4/3)*x=-11/30

x= (3/4)* (-11/30)

x= -11/40, cerinta

Verificare
3 (25/90-36/90)=4/3*(-11/40)

3*(-11/90)=-11/30
-11/30=-11/30 adevarat , ecuatia est bine rezolvata