rút gọn B=1/2^2+1/2^3+....+1/2^100
5/3+8/3^2 + 11/3^3+…+ 302/3^100
C=(5/3)+(8/3^2)+(11/3^3)+...+(302/3^100)
CMR: (2 và 5/9)<C<(3 và 1/2)
Làm cho mình nhanh nha
Rút gọn;
\(A=\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{100}}\)
Cho G= \(\frac{5}{3}+\frac{8}{3^2}+\frac{11}{3^3}+\frac{302}{3^{100}}\)
CMR \(2\frac{5}{9}< G< 3\frac{1}{2}\)
tính
a=100+98+96+.....+2-97-95-93-.....-1
b=1+2-3-3=5+6-7-8+9+10-11-12+.......-299-300+301+302
S=1+2-3-4+5+6-7-8+9+10-11-12+13+14...-299-100+301+302
chứng minh: 23/19 < 5/3 + 8/32 + 11/33 + ...+ 302/3100 < 7/2
a) A=1-2+3-4+5-6+.........+99-100+101
b) B=1+4+5+9+14+......+60+97
c) C=100+98+96+....+2-97-95-.......-1
d) D=1+2-3-4+5+6-7-8+9+10-11-12+.......+299-300+301+302