\(B=1.2+3.4+5.6+...+2017.2018\)
\(\Rightarrow3B=1.2.3+3.4.3+5.6.3+...+2017.2018.3\)
\(\Rightarrow3B=1.2.3+3.4.5+5.6.7+...+2017.2018.2019\)
\(\Rightarrow B=2017.2018.2019:3\)
\(\Rightarrow B=8217947814:3\)
\(\Rightarrow B=2739315938\)
Vậy \(B=2739315938\)
B= 1.2+3.4+5.6+ ... + 2017.2018
1.2+3.4+5.6+...+2017.2018
tính các tổng sau:
A=1.2+2.3+3.4+...+n(n+1)
B=1.2.3+2.3.4+...+n(n+1)(n+2)
C=1.2+3.4+5.6+...+2017.2018
D=1.4+2.5+3.6+...+n(n+3)
Giúp mk nha, ai nhanh mk k!
D = 1.2+2.3+3.4+......+2017.2018
Cho A=1.2+2.3+3.4+4.5+............+2017.2018 va B=2018 mu3/3 So sanh A va B
Tính nhanh
1.2 + 2.3 + 3.4 + 4.5 + ... + 2017.2018
Tính A = 1.2^2+2.3^2+3.4^2+....+2017.2018^2
Cho A=1.2+2.3+3.4+4.5+............+2017.2018 va B=2018 mu3/3 So sanh A va B
B= 1.2+3.4+5.6+.....+ 49.50
