Question

( 1/2 +1 ) x ( 1/3 + 1) x ( 1/4 + 1 ) x ( 1/5 + 1) x ( 1/6 + 1) . Gíup t vs . Mơn rất nhìu :)

Answer 1

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

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

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

\(=\dfrac{7}{2}\)

Answer 2

( 

2

1

 

 +1)×( 

3

1

 

 +1)×( 

4

1

 

 +1)×( 

5

1

 

 +1)×( 

6

1

 

 +1)

 

=

3

2

×

4

3

×

5

4

×

6

5

×

7

6

= 

2

3

 

 × 

3

4

 

 × 

4

5

 

 × 

5

6

 

 × 

6

7

 

 

 

=

3

×

4

×

5

×

 

6

×

7

2

×

3

×

4

×

5

×

6

= 

2×3×4×5×6

3×4×5×6×7

 

 

 

=

7

2

= 

2

7