a) 16<4n<256
<=> 42<4n<44 => n=3
(x+1)4=81=34
=>x+1=3
=>x=2
a) 16<4n<256
<=> 42<4n<44 => n=3
(x+1)4=81=34
=>x+1=3
=>x=2
Tim n thuoc N sao cho 4n-5 chia het cho 2n-1
tim n thuoc z de (4n-3) chia het (3n-2)
Bai1.Tim cac p/s bang p/s 34/51 va co mau la so tu nhien <16
Bai 2.Tim n thuoc z de 5/n-4la 1 so nguyen.
Tim a,b thuoc N
a)\(10^a+16^8=b^2\)
b)\(2^a+80=B^b\)
c)\(4^{15}.9^{15}< 2^a.3^a< 18^{16}.2^{16}\)
Cac ban giup mk voi
a . 2n=2560
3n=729
4n =256
2.2n=256
tìm n biết
bai 1
cho bieu thuc A = 5/n+1 voi N THUOC Z
a, de A la phan so thi n co dieu kien gi ?
b , tim tat ca cac gia tri nguyen cua n de gia tri A la 1 so nguyen ?
bai 2
cho bieu thuc M = 6/n-3 voi n thuoc Z .Co bao nhieu gia tri cua n de :
a, M ko phai la phan so
b , M la phan so va cp gia tri nguyen ?
bai 3 viet tap hop cacs so nguyen sao cho :
-12/4 < x <6/3
Tim n thuoc N : 10^n - 1 chia het cho 9
(2x-1)(3y-2)=27
tim x y biet x y thuoc n
tim cac so tu nhien x , biet :
a, x thuoc U(18) va x thuoc B(4)
b, x thuoc U(36) va x > hoac = 12
c, x thuoc B(12) VA 30 < HOAC = X < HOAC = 100
d, x thuoc U(28) va x thuoc U (21)