Voi n la so nguyen duong tim m

3^n+1+4×2^n-1-81×3^n-3-8×2^n-2+1

Cái đoạn mà 3^n+1

2^n-1          3^n-3       2^n-2

Phep tính phan số đó mik ko biêt viet cac ban thông cãm nha

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong

tinh f(2015)

B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p

tim cac so p,q,r,s

B3 co a,b,c duong a mu 3+bmu3=c^3

so sanh a^2015+b^2015 va c^2015

bài 1 tìm x biết

a)(-2/3)^2.x=(-2/3)^5

b)(-1/3)^3.x=1/81

c)(x-1)^3=27

d)(2x+1)^2=25

e)(2x-3)^2=36

f)5^x+2=625

g)(x-1)^x+2=(x-1)^x+4

h)(2x-1)^3=-8

k)1/4.2/6.3/8.4/10.5/12....30/62.31/64=2^x

bai2 tim so nguyen duong n biet

a)32<2^n<128

b)2,16>=2^n>4

c)9,27<=3^n<=243

so sanh phan so:

a) n/n + 3 va  n - 1/n+4         ( n  thuoc N)

b) n/n + 1 va n + 2/n + 3

c) n/2n + 1 va 3n + 1/6n + 3   ( n thuoc N)

cho a va b la hai so tu nhien. biet a chia cho 5 du 1 ; b chia cho 5 du 4. chung minh (b-a)(b+a) chia cho 4

chung minh 2n^2(n+1)-2n(n^2+n-3) chia het cho 6 voi moi so nguyen n

chung minh n( 3-2n)-(n-1)(1+4n)-1 chia het cho 6 voi moi so nguyen n

cho A = 1+2+3+4+...+n va B = 2n + 1 ( voi n thuoc N , n lon hon hoac bang 2)   chung minh A va B la hai so nguyen to cung nhau