Question

Vă rog mă grăbesc.
Dau coroana

Answer 1

4)17×99=17×(90+9)=17×90+17×9=
1530+153=1683
17×81= 17×(90-9)=17×90-17×9=1563-153=1410

345×101=345×(100+1)=345×100+345×1=
34500+345=34845
345×99=345×(100-1)=345×100-345×1=
34500-345=34155

57×11=57×(10+1)=57×10+57×1=570+57=627
57×9=57×(10-1)=57×10-57×1=570-57=513

97×999=97×(900+90+9)=97×900+97×90+97×9=87300+8730+873=96030+873=96903
97×801=97×(900-90-9)=97×900-97×90-97×9=
87300-8730-873=68570-873=67697
5)150 sticle / ora ( h)
1zi= 24 h
150×24=3600 sticle/zi
1 sapt =7 zile
3600×7=25200 sticle/sapt
6)3 caiete; 1 trusa; 3 creioane; 2 pixuri
3×6+1×12+3×1+2×2=
18+12+3+4=
30+3+4=37