Question

[Han anh]

hay quy dong mau so so sanh sau : A=\(\dfrac{-9}{10^{2010}}\)+\(\dfrac{-19}{10^{2011}}\)

B =\(\dfrac{-9}{10^{2011}}\)+\(\dfrac{-19}{10^{2010}}\)

giup minh nhanh nha . cam on nhiu

Answer 1

[Mới vô]

\(A=\dfrac{-9}{10^{2010}}+\dfrac{-19}{10^{2011}}=\dfrac{-90}{10^{2011}}+\dfrac{-19}{10^{2011}}=\dfrac{\left(-90\right)+\left(-19\right)}{10^{2011}}=\dfrac{-109}{10^{2011}}\)\(B=\dfrac{-9}{10^{2011}}+\dfrac{-19}{10^{2010}}=\dfrac{-9}{10^{2011}}+\dfrac{-190}{10^{2011}}=\dfrac{\left(-9\right)+\left(-190\right)}{10^{2011}}=\dfrac{-199}{10^{2011}}\)\(\text{Vì }\dfrac{-109}{10^{2011}}>\dfrac{-199}{10^{2011}}\text{ nên }A>B\)