Các câu hỏi tương tự
a=1/1.2+1/2.3+1/3.4+1/4.5+....+1/49.50
Chứng minh 1/(1.2)+1/(3.4)+........+1/(49.50)=1/26+1/27+..........+1/50
cmr A=1/1.2+1/3.4+1/5.6+.......+1/49.50=1/26+1/27+........+1/50
CMR: 1/1.2+1/3.4+1/5.6+....+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
1. Cho A = 1/(1.2)+1/(3.4)+...+1/(99.100).
Chứng minh 7/12 < A <5/6
2.Chứng minh:
1/(1.2)+1/(3.4)+...+1/(49.50)=1/26+1/27+...+1/50
a) A = 1/1.2+ 1/3.4+ 1/5.6+...+ 1/99.100
CMR: 7/12<A< 5/6
b) CMR: 1/1.2+ 1/3.4+ 1/5.6+...+1/49.50 = 1/26+ 1/27+ 1/28+...+1/50
cmr :
1/1.2 + 1/3.4+1/5.6+...+1/49.50 = 1/26+1/27+1/28+...+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