CẤP BÁCH...CẤP BÁCH..GIÚP VỚI
M= 2/1.2.3 + 2/2.3.4 + 2/3.4.5 + ....... + 2/48.49.50
Ai nhanh mik k cho nhea
M= 2/1.2.3 + 2/2.3.4 + 2/3.4.5 +......... + 2/48.49.50
AI NHANH MÌK K CHO
AI K MÌK MÌK K LẠI CHO NHEA
Tính nhanh:
5) 1/2 + 1/2^2 + 1/2^3 + 1/2^4 +...+ 1/2^100
6) 1/1.2.3 + 1/2.3.4 + ... + 1/48.49.50
7) -1/3 + 1/3^2 - 1/3^3 + ... + 1/3^100 - 1/3^101
8) 1/1.2.3 + 1/2.3.4 + ... + 1/37.38.39
Cho S=\(\dfrac{5}{1.2.3}+\dfrac{8}{2.3.4}+\dfrac{11}{3.4.5}+...+\dfrac{6068}{2022.2023.2024}\)
So sánh S với 2
giúp mình bài này với!
CMR:\(\frac{5}{1.2.3}\)+\(\frac{8}{2.3.4}\)+\(\frac{11}{3.4.5}\)+...+\(\frac{298}{98.99.100}\)<2
(1/1.2.3+1/2.3.4+1/3.4.5+...+1/9.10.11)x+1/2=x-331/2
Tính nhanh
A=6+16+30+48+...+19600+19998
B=2+5+9+14+...+4949+5049
C=1.2.3+2.3.4+3.4.5+...+98.99.100
Tinh : M= 1.2.3+2.3.4+3.4.5+...+100.101.102./2+21+35+...+133+161+203
Tính:
f) F= 1.2+2.3+3.4+...+n(n+1)
g) G= 1.2.3+2.3.4+3.4.5+...+99.100.101
h) H= 1.2.3+2.3.4+3.4.5+...+n(n+1)(n+2)
i) I= 1.3+2.4+3.5+...+99.100
j) J= 1.4+2.5+3.6+...+99.102