Răspuns :
2+{78-3•[(15+35):5]-21}=
2+[78-3•(50:5)-21]=
2+(78-3•10-21)=
2+(78-30-21)=
2+(78-9)=
2+69=
71 .
2+[78-3•(50:5)-21]=
2+(78-3•10-21)=
2+(78-30-21)=
2+(78-9)=
2+69=
71 .
2+{75*[(15+35):5]-21}=
2+[75*(50:5)-21]=
2+(75*10-21)=
2+(750-21)=
2+729=
731
2+[75*(50:5)-21]=
2+(75*10-21)=
2+(750-21)=
2+729=
731