Question

am nevoie de ajutor, repede, va rog!

Answer 1

4.2x3y divizibil cu 15={2139,2430,2730,2235,2835}
5.U(a)=6+5+4=5
a=5
6.N=2^n×5^n×(5+2+10)=10^n×17
8.(a,b)=8=>a=8×X
b=8×n,(x,n)=1
a×b=76=>8x×8n=768=>n,x=12
x=1,n=12=>a=8,b=96
9.a)288,648b)12,18,24,36
10.(22-12)×2 = (613-199):18-3
10×2=20 = 414:18-3
20 = 23-3
20 = 20