Ta co :
E=\(\frac{2}{2}+\frac{3}{2}+\frac{4}{2}+\frac{5}{2}+...+\frac{201}{2}\)
=\(\frac{2+3+4+5+...+201}{2}\)
=\(\frac{\left[\left(201+2\right)\left(201-2\right):1+1\right]:2}{2}\)
=\(\frac{40398:2}{2}\)
=\(\frac{20199}{2}\)
Đúng thì k không thì giúp tớ với
kết quả ra sai rồi
\(E=\frac{2+3+4+...+201}{2}=\frac{\frac{\left[\left(201-2\right):1+1\right].\left(201+2\right)}{2}}{2}=\frac{\frac{200.203}{2}}{2}=\frac{100.203}{2}\)=10150