Question

4 si 5 va rog cat de repede
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Answer 1

Răspuns:

1. 13- nr prim

D13 {1; 13}

Caz I: 2n+1=1

2n=0

n= 0÷2=0

Caz II: 2n+1=13

2n=12

n=6

2. 2x4 divizibil cu 3

M3 {0; 3; 6; 9; 12; 15; 18...}

Caz I: 2+x+4= 6

x=6-6=0

Caz II: 2+x+4=9

x= 9-6=3

Caz III: 2+x+4=12

x=12-6=6

Caz IV: 2+x+4=15

x= 15-6=9

204+ 234+ 264+ 294= 996