Question

Tính a)(1+1/2).(1+1/3).(1+1/4).(1+1/5).(1+1/6).(1+1/7)

Làm rõ ràng cho mk nhé

Answer 1

\(\left(1+\frac{1}{2}\right).\left(1+\frac{1}{3}\right).\left(1+\frac{1}{4}\right).\left(1+\frac{1}{5}\right).\left(1+\frac{1}{6}\right).\left(1+\frac{1}{7}\right)\)

\(=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.\frac{6}{5}.\frac{7}{6}.\frac{8}{7}\)

\(=\frac{3.4.5.6.7.8}{2.3.4.5.6.7}\)

\(=\frac{8}{2}\)

\(=4\)

Answer 2

a) \(\left(1+\frac{1}{2}\right).\left(1+\frac{1}{3}\right).\left(1+\frac{1}{4}\right).\left(1+\frac{1}{5}\right).\left(1+\frac{1}{6}\right).\left(1+\frac{1}{7}\right)\)

= \(\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.\frac{6}{5}.\frac{7}{6}.\frac{8}{7}\)

= \(\frac{3.4.5.6.7.8}{2.3.4.5.6.7}\)

= \(4\)