Răspuns :
Explicație pas cu pas:
[15-12:(20-16:2)]×2+2
[15-12:(20-8)]×2+2
(15-12:12×2+2)
12:12=1×2+2=4
15-4=11
Salutare!
[15-12:(20-16:2)]•2+2=
[15-12:(20-8)]•2+2=
(15-12:12)•2+2=
(15-1)•2+2=
14•2+2=
28+2=
30
[15-12:(20-16:2)]•2+2=
[15-12:(20-8)]•2+2=
(15-12:12)•2+2=
(15-1)•2+2=
14•2+2=
28+2=
30