Răspuns :
10× (1×3 + 2×1)=
10×(3+2)=
10×5=
50 (becuri sunt in cele 10 camere)
10×(3+2)=
10×5=
50 (becuri sunt in cele 10 camere)
1 camera are un corp de iluminat=3 becuri si 2 veioze(1 veioza=1 bec)=2 becuri =3 becuri +2 becuri=5 becuri intr.o camera
10 camere× 5 becuri=50 becuri
10 camere× 5 becuri=50 becuri