giup minh vs......

1.Tim tat ca cac so nguyen n ( lnl <1000) sao cho can(3n^2 +789) la mot scphuong chia het cho 3.

2. Biet rang x la mot so thuc khac 0, tim gtnn cua bieu thuc: Q = ( 2011,2012x^2 -2x +2013,2014)/(2014,2015x^2)

tim tat ca cac so nguyen duong n sao cho so T=2^n+1 la so chinh phuong 

neu co so tu nhien n sao cho k =n^2 thi ta noi so k la so chinh phuong tim tat ca cac so ab saocho (ab+ba) la so chinh phuong

Voi moi so tu nhien n, dat a_n=3n²+6n+13

a) Chung minh rang neu hai so a_i,a_j khong chia het cho 5 va co so du khac nhau khi chia cho 5 thi a_i+a_j chia het cho 5

b) Tim tat ca cac so tu nhie n le sao cho a_n la so chinh phuong

tim tat ca cac so nguyen duong x,y sao cho cac so x^2+3.y va y^2+3.x deu la so chinh phuong cua 1 so

tim tat ca cac stn n sao cho ( 3ⁿ + 1 ) la 1 so chinh phuong

tim tat ca cac so nguyen x so cho x^2+x-1 la so chinh phuong

1.Tren nua mp bo chua tia Ox,ve cac tia Ox1,Ox2,Ox3,...,OxN sao cho:

xOx2=2xOx1,xOx3=3xOx1,.......,xOxN=NxOx1.tim so N nho nhat de trong cac tia da ve co mot tia la tia phan giac chung cua 2017 goc

2.CMR:neu p la so nguyen to lon hon 3 va 2p+1 cung la so nguyen to thi 4p+1 la hop so

3.So sanh: 63^15 va 34^18

4.tim cac so tu nhien n co hai chu so biet:2n+1 va 3n+1 deu la so chinh phuong

5.CMR: S=16^5+2^15 chia het cho 33

tim tat ca cac so nguyen to p sao cho 5^p+12^p la so chinh phuong