Question

Rezolvați ecuațiile:a)x+7/3=18/2 b)x-5=13/71

Answer 1

x+7/3=18/2
x+7/3=9
3x(x+7)=9
x+7=3x9
x+7=27
x=20
20/3+7/3=27/3
27/3=9

x-5=13/71
13:71=0.18
x-5=0.18
x=0.18+5
x=5.18

Answer 2

x+7/3=18/2
x+7/3=9
3x(x+7)=9x+7=3 x9
x+7=27
x=27-7
x=20 
20/3+7/3=27/3
27/3=9

x-5=13/71
x=13/71+5
s-a adus la acelasi numitor:
x=13/71+355/71
x=368/71=5,18
x=5,18