(x2+7x+2) chia hết cho (x+7)
[x(x+7)+2] chia hết cho (x+7)
=> 2 chia hết cho (x+7) hay (x+7) EƯ(2)={1;-1;2;-2}
=>xE{-6;-8;-5;-9}
=> có 4 số nguyên x thỏa mãn đề
tim cac so x la so nguyen thooa man (x^2 +7x + 2) chia het cho x +7
so cac so nguyen x sao cho (x^2+7x+2):(x+7) la.......
Tim x la so nguyen sao cho
chia het cho
tap hop cac gia tri nguyen cua x thoa man (x^2+4x+13) chia het cho x+4 co so phan tu la
tim tat ca cac so nguyen duong n sao cho:2^n-1 chia het cho 7
bai 1 tim cac stn x y z sao cho x+y+z=xyz
bai 2cmr neu m^2+mn+n^2chia het cho 9 voi m ,n la cac stn thi m,n chia het cho 3
bai 3 tim stn n nho nhat de cac phan so sau toi gian
7/n+9.8/n+10,...,31/n+33
bai 4chung to rang phan so m^3+2m/m^4+3m^2 +1 toi gian
bai 5 a,cmr khong ton tai so chinh phuong nao co dang abab
b,cho 51 so nguyen duong khong vuot qua 100 cmr ton tai 2 so trong 51 so noi tren ma 1 so chia het cho so con lai
c,tim cac so co 3 chu so sao cho hieu cua so ay va gom 3 chu so ay viet theo thu tu nguoc lai la mot so chinh phuong
bai 6cmr A=2x(x+y-1)+y^2+1 luon nhan gia tri khong am voi moi x,y
bai 7 tim hai so nguyen duong sao cho tong ,hieu thuong (so lon chia cho so nho )cua chung cong lai duoc 38
bai 8 cho ba so a,b,c thoa man a/2009=b/2010=c/2011
tinh gia tri cua bieu thuc M=4(a-b)(b-c)-(c-a)^2
tap hop cac gia tri nguyen cua x thoa man (x2+4x+13)chia het cho (x+4) co so phan tu...?
tim cac cap so nguyen duong nguyen to cung nhau sao cho: (x+y)/(x^2+y^2)=7/25
tim tat ca cac so nguyen n sao cho n^2+4 chia het n+2
