B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

cho a,b,c la cac so nguyen duong co a + b +c chia het cho 2 chung minh P=a² + b² + c² la hop so

B1: cho a,b,c la cac so nguyen duong

CMR:neu a /b >hoac bang c/d thi a/b > hoac bang a+c/b+d > hoac bang c/d

B2: Tim PS nho nhat khac 0 sao cho khi chia no cho 14/9 ; cho 45/27 deu duoc thuong la cac so tu nhien 

B3:CMR: 1/2^2 + 1/4^2 + 1/6^2 +....+ 1/100^2 < 1/2

cho a,b,c,d la cac so nguyen duong doi 1 khac nhau thoa man a/a+b  +   b/b+c   +  c/c+d  + d/d+a   =2

CMR abcd la 1 so chinh phuong

cho a,b la so tu nhien .cmr:

neu ab chan thi luon ton tai so c nguyen duong sao cho :a²+b²+c² la so chinh phuong

Cho a, b, c, d la cac so nguyen duong  thoa man a²+b²=b²+d². CM a+b+c+d la hop so