Question

so sánh a = \(\dfrac{1946}{1986}\) và b = \(\dfrac{1968}{2008}\)

Answer 1

\(1=\dfrac{1946}{1986}+\dfrac{40}{1986}\)

\(1=\dfrac{1968}{2008}+\dfrac{40}{2008}\)

\(\Rightarrow\)\(\dfrac{40}{1968}>\dfrac{40}{2008}\)

\(\Rightarrow\dfrac{1946}{1968}>\dfrac{1968}{2008}\)

Answer 2

Vì \(\left\{{}\begin{matrix}1=\dfrac{1946}{1986}+\dfrac{40}{1986}\\1=\dfrac{1968}{2008}+\dfrac{40}{2008}\end{matrix}\right.\)

Mà \(\dfrac{40}{1986}>\dfrac{40}{2008}\)

Nên \(\dfrac{1946}{1986}>\dfrac{1968}{2008}\)

Vậy \(\dfrac{1946}{1986}>\dfrac{1968}{2008}\).