Question

tính nhanh

(1+1/105)*(1+1/106)*(1+1/107)*(1+1/108)*(1+1/109)

Answer 1

 =  106/105 x 107 / 106 x 108 / 107 x 109/108 x 110/109

=  110/105

=22/21

Answer 2

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

\(=\frac{106\times107\times...\times110}{105\times106\times...109}\)

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