\(3^{n+2}-2 ^{n+2}+3^n-2^n=3^{n+2}+3^n-\left(2^{n+2}+2^n\right)=3^n\left(3^2+1\right)-2^n\left(2^2+1\right)\)
\(=3^n.10-2^n.5=3^n.10-2^{n-1}.10=\left(2^n-2^{n-1}\right).10\) chia hết cho 10
chung minh rang voi moi so nguyen duong n thi
10n + 18n -1 chia het cho 27
chung minh rang voi moi N nguyen duong thi 3^n+2 - 2^n+2 + 3^n - 2^n chia het cho 10
tim k sao cho 3^(6n-1)-k.3^(3n-2)+1 chia het cho 7 voi moi so nguyen duong n
Chung minh rang: Voi moi so nguyen duong n thi: 3n+2 - 2n+2 + 3n - 2n chia het cho 10
GIUP MIK VS MOI NGUOI OI!
chung minh rang voi moi so nguyen m thi 4m^3 + 9m^2 - 19m - 30 chia het cho 6
chung minh rang: 3n+2 -2n+2 +3n -3n chia het cho 10 voi moi n nguyen duong
TIM N LA SO NGUYEN SAO CHO
a , 3n +11 chia het cho n
b , 2n - 7 chia het cho n+ 2
c , n2 + 2n + 10 chia het cho n+ 1
CMR voi moi so nguyen duong n thi B=3^n+2 -2^n+2 +3^n -2^n chia het cho 10
chung minh rang voi moi n nguyen duong ta luon co
4^n+3+4^n+2-4^n+1-4^nchia het cho 300
