Question

(\(\dfrac{1}{5}-\dfrac{1}{6}-\dfrac{1}{30}\) ).(\(\dfrac{21}{22}+\dfrac{22}{23}+......+\dfrac{102}{103}\))

Answer 1

\(\left(\dfrac{1}{5}-\dfrac{1}{6}-\dfrac{1}{30}\right).\left(\dfrac{21}{22}+\dfrac{22}{23}+...+\dfrac{102}{103}\right)\)

\(=0.\left(\dfrac{21}{22}+\dfrac{22}{23}+...+\dfrac{102}{103}\right)\)

\(=0\)

Answer 2

vì \(\dfrac{1}{5}-\dfrac{1}{6}-\dfrac{1}{30}\)=0 nên

(15−16−13015−16−130 ).(2122+2223+......+102103)=0