Các câu hỏi tương tự
tim so tu nhien n de 2n+1 va 7n+2 la hai so nguyen to cung nhau
BAI 1: TIM SO TU NHIEN N DE MOI CAP SO SAU LA SO NGUYEN TO:
A, 7N+13 VA 2N+4
B, 12N+5 VA 9N+4
BAI 2: TIM * DE (81**)CHIA HET CHO 6;7;13
PLEASE GIUP MK.........
voi n so tu nhien thoa man 6n+1 va 7n-1 la hai so tu nhien khong nguyen to cung nhau thi uoc chung lon nhat cua 6n+1 va 7n-1 la bao nhieu
chung minh rang voi moi so tu nhien n, cac so sau la hai so nguyen to cung nhau:
a) 7n + 10 va 5n + 7
b) 2n +3 va 4n +8
Tim 3 so tu nhien a,b,c nho nhat khac 0 sao cho 64a=80b=96c
Chung to rang (7n+10)va (5n+7) la 2 so nguen to cung nhau (n thuoc N)
chung to rang voi moi so tu nhien N gia tri cua 2 bieu thuc 7n+10 va 5n+7 luon la 2 so nguyen to cung nhau
cho n la so tu nhien bat ki ;chung minh rang (n+3) va(2n+5) la 2 so nguyen to cung nhau
a, Cho ( a,b) = 1 . Chung minh rang (a.b, a+b)=1
b, Cho (a,b)= 1. Tim UCLN (11a+2b , 18a +5b)
C,, Cho A = m+n ; B=m^2+n^2.Trong do m va n la cac so tu nhien nguyen to cung nhau. Tim UCLN (A,B)
d, Tim cac so tu nhien n sao cho n^3 - n^2 + n-1la so nguyen to
cho a la so tu nhien le b la so tu nhien chung minh rang so a va ab + 4 la 2 so nguyen to cung nhau