Các câu hỏi tương tự
\(A=\frac{\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{49}+\frac{1}{50}}{\frac{100}{1}+\frac{49}{2}+...+\frac{2}{49}+\frac{1}{50}}\)= ?
e, \(\frac{49}{1}+\frac{48}{2}+\frac{47}{3}+.......+\frac{2}{48}+\frac{1}{49}=50.\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+.......+\frac{1}{50}\right)\)
Tính
\(S^4=1^2+2^2+3^2+...+49^2+50^2\)
\(S^5=1^3+2^3+3^3+...+49^3+50^3\)
CMR: 1/26 + 1/27 + 1/28 + ... + 1/50 = 1 - 1/2 + 1/3 - 1/4 + ... + 1/49 - 1/50
gấpp ạaaa
1/1*2+1/3*4+1/5*6+...+1/49*50=1/26+1/27+1/28+...+1/50
1/1*2+1/3*4+1/5*6+...+1/99*100
chứng minh rằng:1/1*2+1/3*4+...+1/49*50=1/26+1/27+...+1/50
chứng minh
1/1*2+1/3*4+1/5*6+...+1/49*50=1/26+1/27+....+1/50
chung minh rang:1/(1*2)+1/(3*4)+1/(5*6)+.....+1/(49*50)=1/26+1/27+1/28+....+1/50
1/50-1/50*49-1/49*48-...-1/2*1