Cho Bt : n-3/n-5
a,Tinh gia tri cua A biet n = 6
b,So nguyen n phai co dieu kien gi de A la phan so ?
c, Tim n de A nhan gia tri nguyen
biet a/b-c=a+b/c=a/bvoi a,b,c la 3 so nguyen duong phan biet .tinh a/b
a) cho 2 stn a va b voi a<b thoa man 3(a+b) =5(a-b)
tim thuong cua 2 so
b) Tim cac so Nguyen Duong a, b, c biet rang : a3-b3-c3 =3abc va a2=2(b+c)
tim so nguyen a;b biet :
a)3a-1 la boi cua 2a+1
b)a+b=ab
mau len nha toi rat can gap
ki hieu [x] la so nguyen lon nhat ko vuot qua x. tim [A] biet
A=1/22+1/32+...+1/20142
giup dum
tim so nguyen a de a^2 + a + 3 / a+1 la so nguyen
tim cac so nguyen duong a,b,c biet a^3-b^3-c^3=3abc va a^2=2(b+c)
nho giai thich ro ho minh nhe
Cho B(x)=ax^2 +bx+c(a b c la so nguyen). Biet B(x) chia het cho 3. CMR a b c chia het cho 3
cho p la phan so nguyen to lon hon 3
a) tim so du khi p binh phuong cho 3
b) hoi p binh phuong +2015 la so nguyen to hay hop so
