Question

descompune in numere prime a) 21,30,45,51 b)120,144,180,210 c)1001, 1331,2480,5880

Answer 1

Eu o sa scriu cu semnul de impartire tu sa scri cum ai invatat la scoala pentru ca eu nu am posibilitatea sa scriu cccum se invata la scoala.
21=7x3
21:7=3:3=1

30=5x3x2
30:5=6:3=2:2=1

45=5x3x3
45:5=9:3=3:3=1

51=3x17
51:3=17:17=1

b)
120=5x2x2x3x2(sa scri la putere)
120:5=24:2=12:2=6:3=2:2=1

144=2x2x3x2x3x2
!44:2=72:2=36:3=12:2=6:3=2:2=1

180=5x3x2x3x2
180:5=36:3=12:2=6:3=2:2=1

210=5x2x3x7
210:5=42:2=21:3=7:7=1

c)2480=
2480:5=496:2=248:2=124:2=62:2=31:31=1

Answer 2

21=3•7
30=2•3•5
45=3²•5
51=3•17

120=2³•3•5
144=2⁴•3²
180=2²•3²•5
210=2•3•5•7

1001=7•11•13
1331=11³
2480=2⁴•5•31
5880=2³•3•5•7²