A=1+3/2^3+4/2^4+5/2^5+...100/2^100
1/2*A = 1/2 + 3/2^4 + 4/2^5 +....+ 99/2^100 + 100/2^101
A- A/2 = 1/2A =1/2 + 3/2^3 + 1/2^4 +...+1/2^100 - 100/2^101=
= [1/2+1/2^2 +1/2^3 +...+1/2^100] -100/2^101 (Do 3/2^3 = 1/2^2 +1/2^3)
=[1-(1/2)^101]/(1-1/2) -100/2^101 =
=(2^101 -1)/2^100 - 100/2^101
=> A= (2^101 -1)/2^99 - 100/2^100
Tính A = 1 + 3/2^3 + 4/2^4 + 5/2^5 + ... + 100/2^100
Tính:
A= 1+ 3/ 2^3 + 4/ 2^4 + 5/ 2^5 +..........+ 100/ 2^100
Tính A= 1+(3/2^3)+(4/2^4)+(5/2^5)+........+(100/2^100)
Tính A: 1+3/2^3+4/2^4+5/2^5+....+100/2^100
A=1+3/2^3+4/2^4+5/2^5+...100/2^100 tính A
tính A=1=3/2^3+4/2^4+5/2^5+.......+100/2^100
A= 2^2 + 2^3 + 2^4 + 2^5 +...+ 2^100
B= 3^2 + 3^4 + 3^6 + ...+ 3^100
C=5^1 + 5^3 + 5^5 + ... + 5^99
Tính TỔNG QUÁT: S= a + a^2 + a^3 + a^4 + ...+ a^n
Tính A=1+3/23+4/24+5/25+...+100/2100
tính :A =1+\(\frac{3}{2^3}+\frac{4}{2^4}+\frac{5}{2^5}+...+\frac{100}{2^{100}}\)
