Question

 1-5-9+13+17-21-25+........-393+397+401

 

Answer 1

\(1-5-9+13+17-21-25+...-393+397+401\)

\(=\left(1-5-9+13\right)+\left(17-21-25+29\right)+...+\left(385-389-393+397\right)+401\)

\(=0+0+...+0+401=401\)

Answer 2

1−5−9+13+17−21−25+...−393+397+401

=(1−5−9+13)+(17−21−25+29)+...+(385−389−393+397)+401

=0+0+...+0+401=401

Answer 3

tham khảo

1−5−9+13+17−21−25+...−393+397+401

=(1−5−9+13)+(17−21−25+29)+...+(385−389−393+397)+401

=0+0+...+0+401=401