Question

[Trương Kim Chi]

Tính nhanh:
( 1 + 1/105 ) x ( 1 + 1/106 ) x ( 1+ 1/107 ) x ( 1+ 1/108 ) x ( 1+ 1/109 )

Answer 1

[Nguyễn Huy Hải]

\(=\frac{106}{105}\times\frac{107}{106}\times\frac{108}{107}\times\frac{109}{108}\times\frac{110}{109}\)

\(=\frac{110}{105}=\frac{22}{21}\)