1 Tính: A=1/10+1/15+1/21/+......+1/120
Tính A=1/10 + 1/15 + 1/21 +...+1/120
A=1/3+1/6+1/10+1/15+1/21+...+1/105+1/120
Cho A = 1/10 + 1/15 + 1/21 +....+ 1/120 Tìm x sao cho A :x = 759
Tinhs nhanh tổng sau:
A=1/10+1/15+1/21+...+1/120
1/10+1/15+1/21+...+1/120 = ?
1/10+1/15+1/21+......+1/120 = ?
1/10+1/15+1/21+...+1/120
Tính:B=1/10+1/15+1/21+....+1/120
