Question

A= 3/1.4 + 3/4.7 + 3/7.10 +...+ 3/40.43

Answer 1

A = 1/1 -1/4 +1/4 - 1/7 +1/7 ........+1/40 - 1/43 

A = 1/1 - 1/43 

A = 42/43

Answer 2

A=1 - 1/4 + 1/4 - 1/7 + .... + 1/40 - 1/43

  = 1 - 1/43 

  = 42/43

Answer 3

=42/43 nha bn