Các câu hỏi tương tự
Voi moi so tu nhien n, dat an=3n2+6n+13
a) Chung minh rang neu hai so ai,aj khong chia het cho 5 va co so du khac nhau khi chia cho 5 thi ai+aj chia het cho 5
b) Tim tat ca cac so tu nhie n le sao cho an la so chinh phuong
Chung minh rang voi moi so tu nhien n ta co: 7.52n + 12.6n chia het cho 19
chung minh rang
a)301293-1 chia het 9 b)62n+3n+2.3n chia het cho11 c)2093n-803n-464n-261n chia het cho 271
d) 52n+1.2n+2+3n+2.22n+1 chia het cho 19
cho A= n^6-n^4+2n^3+2n^2 voi n>1. chung minh A khong phai so chinh phuong
cho phuong trinh 2x^2+mx+2n+8=0 (voi m;n thuoc Z) gia su phuong trinh co 2 nghiem deu nguyen chung minh m^2+n^2 la hop so
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)
giai ho minh bai nay voi
cho a,b,c la do dai 3 canh tam giac va an;bn;cn cung la do dai 3 canh tam giac voi n la so nguyen duong. Chung minh rang 2 trong 3 so a,b,c bang nhau
chung minh rang voi moi so tu nhien n >1 thi A=n(n+1)(n+2)....(n+7)+7! khong viet duoc thanh tong 2 so chinh phuong
CMR: VOI MOI n\(\in\)N* THI n! KHONG CHIA HET CHO \(2^n\)