Răspuns:
a) 2·10³ + 5·10² + 7·10 + 1 =
2·1000 + 5·100 + 70 + 1 =
2000 + 500 + 70 + 1 = 2571
b) 7·10² + 2 · 10 + 3 = 7·100 + 20 + 3 =
700 + 23 = 723
c) 5·10 +2 = 50 + 2 = 52
d) 3·10⁴ + 5·10³ + 7·10² + 5·10 + 3 =
3·10000 + 5·1000 + 7·100 + 50 + 3 =
30000 + 5000 + 700 + 50 + 3 = 35753
[tex]\bf e)~7\cdot10^2+5\cdot10=700+50=750[/tex]
[tex]\bf f)~2\cdot10^2+5\cdot10+3=200+50+3=253[/tex]
[tex]\bf g)~5\cdot10^4+7\cdot10^3+2\cdot10=50000+7000+20=57020[/tex]
[tex]\bf h)~3\cdot10^7+5\cdot10^5+3\cdot10^4+5\cdot10+7 = 30530057[/tex]
[tex]\bf i)~1\cdot10^3+1=1000+1=1001[/tex]
