Numere prime,numere compuse
Presentation
•
Mathematics
•
5th Grade
•
Medium
Dana Catana
Used 5+ times
FREE Resource
7 Slides • 10 Questions
1
Numere prime,numere compuse
2
Cati divizori are numarul 9
9=3x3
Divizorii lui 9 sunt {1, 3, 9}
3
Cati divizori are numarul 11
11 se divide doar cu 1 si cu 11
4
Cati divizori are numarul 101?
101 se divide doar cu 1 si cu 101
5
DEFINITII
1. Un numar natural care se divide doar cu 1 si cu el insusi ,se numeste numar prim!
2. Un numar natural care are si alti divizori cecat 1 si el insusi, se numeste numar compus!
6
OBSERVATIE
Orice numar natural care are doar doi divizori este numar prim!(are doar divizori improprii)
1 nu este nici numar prim si nici compus!
2 este singurul numar prim par!
Orice numar prim mai mare decat 2 este un numar impar!
Numerele compuse se descompun in mod unic in produs de puteri ale unor numere prime!
7
EXEMPLE
5 este numar prim
4=22 este numar compus
12=22x3 este numar compus
18 = 2x32 este numar compus
cel mai mic numar prim de trei cifre este 101
cel mai mare numar prim de doua cifre este 97
8
Multiple Choice
Daca a<b sunt doua numere prime si suma lor este 2019, atunci b este
2
3
2001
2017
2018
9
Multiple Choice
7 este numar prim
a
f
10
Multiple Choice
13 este numar prim
a
f
11
Multiple Choice
123 este numar prim
a
f
12
Multiple Choice
573 este numar compus
a
f
13
Multiple Choice
7029 este numar compus
a
f
14
Multiple Choice
primele 10 numere prime sunt 1, 2, 3, 5, 7, 11, 13, 17, 19, 23
a
f
15
Multiple Choice
Al 5-lea numar natural prim este 11
a
f
16
Multiple Choice
Daca suma a doua numere prime este 13 atunci numerele sunt
3 si 10
5 si 8
2 si 11
9 si 4
17
Multiple Choice
Dac numarele naturale prme a si b indeplinesc relatia 3a+4b=18, atunci a este
3
5
7
2
9
Numere prime,numere compuse
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