Question

Tinh NHANH

m = 2/3.5+2/5.7+2/7.9+.....+2/97.99

Answer 1

2/3.5+ 2 /5.7+ 2/7.9+...+ 2/97.99
=1/3 - 1/5 + 1/5 - 1 /7 +.... + 1/97 - 1/99
=1/3 - 1/99
=32/99

Answer 2

m=/3.5+2/5.7+2/7.9+.....+2/97.99

=m=1/3-1/5+1/5-1/7+.......+1/97-1/99

m=1/3-1/99

=32/99