Observe the characteristics of the following sequence, fill in the blanks with appropriate numbers, and write a general formula for each sequence 1.( ),-4,9,( ),25,( ),49 1, radical 2, (), 2, radical 5, (), radical 7 ------------------ How to write this,

Observe the characteristics of the following sequence, fill in the blanks with appropriate numbers, and write a general formula for each sequence 1.( ),-4,9,( ),25,( ),49 1, radical 2, (), 2, radical 5, (), radical 7 ------------------ How to write this,

1,-4,9,-16,25,-36,49
(-1)^(n+1)*n^2
1,√2,√3,2,√5,√6,√7
√n