Các câu hỏi tương tự
Đặt A=\(\frac{1}{1.2}+\frac{1}{3.4}+...+\frac{1}{101.102}\)
B=\(\frac{1}{52.102}+\frac{1}{53.101}+...+\frac{1}{102.52}\)
CMR: A/B thuộc Z
Chứng minh rằng:
a)\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}< \frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}\)
b)\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}< 1-\frac{1}{2.3}\)
Cần gấp, ai nhanh mik tick nha
1) 3x-5y/2=7y-3z/3=5z-7x/4 và x+y+z=17
Tìm x,y,z
2) CM: 1/1.2+1/3.4+1/5.6+.............+1/49.50=1/26+1/27+1/28+.........+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
1/1.2+1/3.4+1/5.6+...+1/99.100
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
Tính A= 1/1.2 + 1/3.4 + 1/5.6 +..................+1/2013.2014