Question

Tính tổng: S = \(\dfrac{27+4500+135+550.2}{2+4+6+...+14+16+18}\)

Answer 1

\(S=\dfrac{27+4500+135+550.2}{2+4+6+...+14+16+18}\)

\(S=\dfrac{4527+135+1100}{\left(2+18\right).9.2}\)

\(S=\dfrac{4662+1100}{20.9.2}\)

\(S=\dfrac{5762}{90}\)

\(S=\dfrac{2881}{45}\)

Answer 2

`S=(27+4500+135+550.2)/(2+4+6+…+14+16+18)`

`S=(27+4500+135+1100)/((2+18)+(4+16)+…+(8+12)+10)`

`S=((27+135)+(4500+1100))/(20+20+…+20+10)` `(`Có `4` số hạng `20)`

`S=(162+5600)/(20.4+10)`

`S=5762/90`

`S=2881/45`