400+800:4-[680:2+4×(20+12+18)]

Răspuns :

400+800:4-(680:2+4x(20+12+18))=
400+200-(340+4x(32+18))=
400+200-(340+4x50)=
600-(340+200)=
600-540=
60
400+800:4-[680:2+4×(20+12+18)]=
400+800:4-(680:2+4×50)=
400+800:4-(340+200)=
400+800:4-540=
400+200-540=
600-540=
=60
Sper că te-am ajutat!