Question

99+98+97+96+....+4+3+2+1

Answer 1

99+98+97+96+.....+4+3+2+1=?

99+98+97+96+.....+4+3+2+1=4950

hok tốt

Answer 2

\(SSH=\left(99-1\right):1+1=99\)

TỔNG\(=\left(99+1\right)\)X   \(99:2=4950\)