ta có : A= \(\dfrac{352}{353}+\dfrac{353}{354}+\dfrac{354}{355}\)
ta có : B=\(\dfrac{352+353+354}{353+354+355}\)
=> B=\(\dfrac{352}{353+354+355}+\dfrac{353}{353+354+355}\)+\(\dfrac{354}{353+354+355}\)
mà \(\dfrac{352}{353+354+355}< \dfrac{352}{353}\)
rồi tự tính