Explicație pas cu pas:
1) 72×29= 72 ×20 + 72 × 9=
=1440 + 648= 2088
2) 163 ×34=
= 100×34 +60 ×34+3×34=
=3400+340×6+90+12=
=3400+1800+240 +102=
=5200+ 342=5542
3) 258 ×45=
=200 ×45 + 50 ×45 + 8×45=
=9000 +2250 + 360=
=11250+ 360= 11610
Răspuns:
1. 72x29=2088
2. 163x34=5542
3. 258x45=11610
Succes ..
