Question

tính A = 1 + 1/8 +1/24 + 1/48 + 1/80 + 1/120

Answer 1

\(1\frac{5}{24}=\frac{29}{24}\)

Answer 2

A = 1 + 1/2.4 + 1/4.6 + 1/6.8 + 1/8.10 + 1/10.12

2A = 2 + 2/2.4 + 2/4.6 + 2/6.8 + 2/8.10 + 2/10.12

     = 2 + 1/2 - 1/4 + 1/4 - 1/6 + 1/6 - 1/8 + 1/8 - 1/10 + 1/10 - 1/12

     = 2 + 1/2 - 1/12 = 29/12

=> A = 29/12 : 2 = 29/24

Tk mk nha

Answer 3

A =1+ 1/2.4 + 1/4.6 +1/6.8+1/8.10+1/10.12

=1+1/2 -1/4 +1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12

=1+1/2-1/12

=3/2-1/12

=17/12

Answer 4

A = 1 + 1/2.4 + 1/4.6 + 1/6.8 + 1/8.10 + 1/10.12
A x 2 = 2 + 2/2.4 + ... + 2/10.12
A x 2 = 2 +1/2 - 1/4 + 1/4 - 1/6 + ... + 1/10 - 1/12
A x 2 : 2 = (2 + 1/2 - 1/12) : 2
A = 29/24