Question

1+2+3+4+5+...+97+98+99+100=

Answer 1

= 100 × (100+1) : 2 = 5050

^-^

Answer 2

=100 x (100+1) : 2=5050 nha bạn!

k mình nha ^-^

Answer 3

\(1+2+...+99+100\)

\(=\frac{100.\left(100+1\right)}{2}\)

\(=5050\)

học tốt!!!