cho:
A=2^0+2^1+2^2+2^3+...+2^2009+2^2010
Tìm số dư khi chia A cho 7
Cho:A=1+2+22+...+22009+22010
Tìm số dư khi chia A cho 7
\(1+2+2^2+...+2^{2009}+2^{2010}\)
\(1+\left(2+2^2+2^3\right)+...+\left(2^{2008}+2^{2009}+2^{2010}\right)\)
=\(1+2\left(1+2+2^2\right)+...+2^{2008}\left(1+2+2^2\right)\)
=\(1+\left(2+2^4+...+2^{2008}\right)\left(1+2+2^2\right)\)
=\(1+\left(2+2^4+...+2^{2008}\right)7\)
=>\(1+2+2^2+...+2^{2009}+2^{2010}\) chia cho 7 dư 1
cho A=2^0+2^1+2^3+.....+2^2009+2^2010. Tìm số dư khi chia A cho 7
Cho A = 2^0 + 2^1 + 2^2 + 2^3 + ... + 2^2009 + 2^2010
Tìm số dư khi chia A cho 7
Cho A=2^0+2^1+2^2+2^3+2^4+2^5+2^6+2^7+..........+2^2009+2^2010. Tìm số dư khi A chia cho7
cho \(A=2^0+2^1+2^2+2^3+2^4+....+2^{2009}+2^{2010}\).Tìm số dư khi chia A cho 7
Cho A = \(2^0+2^1+2^2+2^3+...+2^{2009}+2^{2010}\)
Tìm số dư khi chia A cho 7
Cho A = \(2^0+2^1 +2^2+2^3+...+2^{2009}+2^{2010}\)
Tìm số dư khi chia A cho 7
Ta có: A=20+21+22+23+…+22009+22010
=>A=(20+21+22)+…+(22008+22009+22010)
=>A=(20+21+22)+…+22008.(20+21+22)
=>A=7+…+22008.7
=>A=(1+…+22008).7 chia hết cho 7
=>A chia hết cho 7
=>A chia 7 dư 0
A=2^0+2+2^2+...+2^2009+2^2010. Tìm số dư khi chia A cho 7
Cho A=20+21+22+23+...+22009+22010. Tìm số dư khi chia cho 7
A =1+ (2+22+23) + ( 24+25+26 ) + .....+ ( 22008 +22009+22010) = 1+ 7 .( 2+24 + 27 +.....+ 22008)
=> A chia 7 dư 1
ta co :
A=20+21+22+...22009+22010
=>A=(20+21+22)+...+(22008+22009+22010)
=>A=(2^0+2^1+2^2)+...+2^2008.(2^0+2^1+2^2)
=>A=(1+...+2^2008).7 chia het cho 7
=>A chia het cho 7
=>A chia het cho 7 du 0
**** nhe