Răspuns:
15x(13+12)=15x25=375
(15x13)+(15x12)=195+180=375
4x(70-20)=4x50=200
(4x70)-(4x20)=280-80=200
23x(20+6)=23x26=598
(23x20)+(23x6)=460+138=598
(17-15)x14=2x14=28
(17x14)-(15x14)=238-210=28
