Question

A=1/15+1/35+......+1/2499

Answer 1

Tham khảo

=1/2(2/3.5 + 2/5.7 +.....+2/49.51

=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)

=1/2(1/3-1/51)

=1/2.16/51

=8/51

Answer 2

Tham khảo

=1/2(2/3.5 + 2/5.7 +.....+2/49.51

=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)

=1/2(1/3-1/51)

=1/2.16/51

=8/51