Violympic toán 6
Các câu hỏi tương tự
Cho p la snt lon hon 3. Biet 8p + 1 cung la snt . Hoi 4p + 1 la so nguyen to hay hop so.
chung minh rang hieu cua 2 phan so toi gian la 1 so nguyen thi 2 phan so co mau bang nhau hoac doi nhau
HIEU HAI SO LA 44,3.NEU SO BI TRU TANG THEM 12,7 ; SO TRU GIAM DI 21,5 THI HIEU HAI SO LUC SAU LA BAO NHIEU
1.goi A la tap hop cac so tu nhien co 2 chu so chia het cho 5 .Tong cac phan tu la:
2Gia tri nho nhat cua bieu thuc A=(x^2+2)^2 la
Tim so nguyen to p de p+4 va p+8 la so nguyen to
cho p; p+20 va p+40 la cac so nguyen to
chung minh rang p+80 cung la so nguyen to
Tim cac so nguyen n sao cho:
A=\(\dfrac{n-3}{n+1}\)la so nguyen C=\(\dfrac{2n+3}{n-1}\)la so nguyen
B=\(\dfrac{2n-3}{n+2}\)la so nguyen D=\(\dfrac{-n+5}{n+2}\)la so nguyen
3n+1 va 4n+1 la 2 so nguyen to cung nhau
tim n de n^3 - n^2 + n -1 la so nguyen to