Question

afla termenul x: {[(x+2)•2+2]•2+2}•2+2=30

Answer 1

{[(x+2)*2+2]*2+2}*2+2=30
{[(x+2)*2+2]*2+2}*2=28
{[(x+2)*2+2]*2+2}=14
[(x+2)*2+2]*2=12
[(x+2)*2+2]=6
(x+2)*2=4
x+2=2
x=2-2
x=0

Answer 2

(((x+2)x2+2)x2+2)x2+2=30
(((x+2)x2+2)x2+2)x2=30-2
                                 =28
(((x+2)x2+2)x2+2)=28:2
                             =14
((x+2)x2+2)x2=14-2
                       =12
((x+2)x2+2)=12:2
                   =6
(x+2)x2=6-2
            =4
x+2=4:2
x+2=2
x=2-2
x=0