tim so hoan chinh n biet khi phan tich ra thua so nguyen to n=2p;n=2²p;n=2⁴p .ma p la so nguyen to lon hon 2

tim n la so tu nhien biet:

A=(n-2).(n²+n-1) la so nguyen to

cho bieu thuc B=4/n-3 voi n la so nguyen

a, so nguyen n phai co dieu kien gi de B la phan so

b, Tim so B biet n=0;n=10;n=-2

                     THANKS NHIU

bai 1 tim so tu nhien co 4 chu so ab cd biet abcd+abc+ab+a=4321.tim abcd

bai 2 cho m , n la cac so tu nhien va p la so nguyen to thoa man 9/m-1=m+n/p. tinh A= p^2-n

bai 3 tim so co 3 chu so biet abc 1000/a+b+c=abc.

Biet rang 3n cong 1 va 5n cong 4 (n thuoc N ) la 2 so khong nguyen to cung nhau . Tim UCLN cua 2 so tren

tim x thuoc N biet 97.x la so nguyen to ( . la dau nhan)

cho A=n-1/n-4

tim n nguyen de A la mot phan so

tim n nguyen de n la mot so nguyen

Cho so nguyen to n co 2 chu so hang chuc la x, hang don vi la y. Biet M=n/x+y. Tim n de M=2. Tim n de M dat gia tri nho nhat

1. Cho Phan so B=\(\frac{n}{n-4}\)(voi n \(\in\)Z)

a. Tim So nguyen n de B la Phan so

b. Tim so Nguyen n de B co Gia tri la so tu nhien

2. Tim cac so nguyen x, y biet

a.\(\frac{x}{-3}=\frac{4}{y}\)

b. \(\frac{2}{x}=\frac{y}{-9}\)