Răspuns :
2+(a+2+8: 4) x2=22
(a+2+8: 4) x2=22-2
(a+2+8: 4) x2=20
(a+2+8: 4) =20: 2
(a+2+8: 4) =10
(a+2+2) =10
(a+4) =10
a=10-4
a=6
(a+2+8: 4) x2=22-2
(a+2+8: 4) x2=20
(a+2+8: 4) =20: 2
(a+2+8: 4) =10
(a+2+2) =10
(a+4) =10
a=10-4
a=6
2+(a+2+8:4)×2=22
2+(a+2+8:4)=22:2=11
a+2+8:4=11-2=9
a+2+8=9×4=36
a+2=36-8=28
a=28-2
a=26