Question

 Fami cần gấp SOS 6h30 đã phải xong rồi

A=(1+1/2)X(1+1/3)X(1+1/4)X(1+1/5)X(1+1/6)

Answer 1

\(A=\left(1+\dfrac{1}{2}\right)\times\left(1+\dfrac{1}{3}\right)\times\left(1+\dfrac{1}{4}\right)\times\left(1 +\dfrac{1}{5}\right)\times\left(1+\dfrac{1}{6}\right)\)

\(=\dfrac{3}{2}\times\dfrac{4}{3}\times\dfrac{5}{4}\times\dfrac{6}{5}\times\dfrac{7}{6}\)

\(=\dfrac{3\times4\times5\times6\times7}{2\times3\times4\times5\times6}=\dfrac{7}{2}\)

Answer 2

`A = (1 + 1/2) xx (1 + 1/3) xx ( 1 + 1/4) xx ( 1 + 1/5) xx (1 + 1/6)`

`= 3/2 xx 4/3 xx 5/4 xx 6/5 xx 7/6`

`= (3xx4xx5xx6xx7)/(2xx3xx4xx5xx6)`

`= 7/2`

`= 3,5`