c/m
72007+82008-92009 chia hết cho 10
Tim GTLN của \(M=2009-\left|x-7\right|-\left(2y+4\right)^{2008}\)
Chứng minh rằng:
\(7^{2007}+8^{2008}-9^{2009}\) chia hết cho 10
Chứng minh rằng:
\(7^{2007}+8^{2008}-9^{2009}\) chia hết cho 10
tìm x bt \(\left(3x-7\right)^{2009}=\left(3x-7\right)^{2007}\)
\(\left|3x-5\right|=2009\left(2010^{2009}+2010^{2008}+...+2010+1\right)-2010^{2010}+5\)
Cho A = 20+21+22+23+...............+22009+22010
Tìm số dư khi chia A cho 7
Chứng minh rằng
M=20112007+20112008+20112009+20112010+20112011+20112012 chia hết cho 2012
tìm x
a) \(\dfrac{3}{7}x-\dfrac{2}{3}x=\dfrac{10}{21}\)
b) \(\dfrac{7}{35}:\left(x-\dfrac{1}{3}\right)=-\dfrac{2}{25}\)