\(B=1.2+3.4+5.6+...+99.100\)
\(3.B=1.2.3+3.4.3+5.6.3+....+99.100.3\)
\(3.B=1.2.3+3.4.5+5.6.7+...+99.100.101\)
\(\Rightarrow B=\frac{99.100.101}{3}=333300\)
Tính B = 1.2 + 3.4 + 5.6 + ..... 99.100
tính tổng : A=1.5 + 5.9 + ....+97.101+101.105
B=1.2^2+2.3^2+3.4^2+....+99.100^2
C=1.2+3.4+5.6+7.8+...+99.100
D=1.2.3+2.3.4+...+98.99.100
Tìm F biết F= 1.2 + 3.4 + 5.6 +......+ 99.100
tính hợp lí:
a 2.53.12+4.6.87-3.8.40
b C=4/5.7+4/7.9+...+4/59.61
c B=1.2+2.3+3.4+...+99.100
d E=1.2+3.4+5.6+...+99.100
F=1.4+2.5+3.6+....+97.100
1.2+3.4+5.6+...+99.100=
Tính : A= 1.2+3.4+5.6+...+99.100
Cho A = 1/51 + 1/52+ 1/53 +...+ 1/100
B = 1/1.2 + 1/3.4 +1/5.6+...+ 1/99.100
A/ B = ?
Tính nhanh 1.2+3.4+5.6+............99.100
Tính tổng 1.2+3.4+5.6+.....+99.100
