a)nếu 200910+9=200919
vậy 200919>201010suy ra A>B
nếu 36:32=4 và 47:43 =47-3=44
vậy 4<44 suy ra A<B
chúc bn
hok tốt
a) \(A=2009^{10}+2009^9\)và \(B=2010^{10}\)
\(A=2009^{10}+2009^9=2009^9\left(2009+1\right)=2009^9.2010\)
\(B=2010^{10}=2010.2010^9\)
Vì 2010>2009 nên \(2010^9>2009^9\)Suy ra: B>A
b) \(A=36:3^2=6^2:3^2=\left(6:3\right)^2=2^2=4\)
\(B=4^7:4^3=4^{7-3}=4^4\)
=> B>A