\(1\frac{1}{2}+2\frac{2}{3}+3\frac{3}{4}+...+50\frac{50}{51}+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...\frac{1}{51}\)
Tính \(1\frac{1}{2}+2\frac{2}{3}+3\frac{3}{4}+4\frac{4}{5}+...+50\frac{50}{51}+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{51}\)
Tính: \(1\frac{1}{2}+2\frac{2}{3}+3\frac{3}{4}+...+50\frac{50}{51}+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{51}\)= ________?
1/1*2*3+1/2*3*4+1/3*4*5+...+1/50*51*52
-1/3+1/3^2-1/3^3+...+1/3^50-1/3^51
-1/3 +-1/3^2 - 1/3^3 + ..... + 1/3^50 - 1/3^51
,E= - 1/3 + 1/(3 ^ 2) - 1/(3 ^ 3) + 1/(3 ^ 4) -...+ 1 3^ 50 - 1 3^ 51
-1/3 + 1/3^2 - 1/3^3 +...............+ 1/3^50 - 1/3^51
-1/3+1/3^2-1/3^3+1/3^4-...+1/3^50-1/3^51
cần gấp
