Question

tim so nguyen n de 6n-3/3n+1 la 1 so nguyen 

Answer 1

Ta co :\(\frac{6n-3}{3n+1}=\frac{2\left(3n+1\right)-5}{3n+1}=2-\frac{5}{3n+1}\)

De 6n-3/3n+1 la so nguyen \(\Leftrightarrow\)5 chia het cho 3n+1

                                        \(\Leftrightarrow\) 3n+1 \(\in\) U(5)

xong lap bang ra lam tiep nhe

Answer 2

ta có

6N-3 /3N+1=2-5/3N+1

=>ĐỂ 2-5/3N+1 LÀ SỐ NGUYÊN

=>5/3N+1 LÀ SỐ NGUYÊN

=>3N+1 THUỘC Ư 5=1,5

=>3N+1=1=>.....