ta có:
\(A=1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{64}\) = \(1+\frac{1}{2}+\left(\frac{1}{3}+\frac{1}{4}\right)+\left(\frac{1}{5}+..+\frac{1}{8}\right)+...+\left(\frac{1}{33}+...+\frac{1}{64}\right)\)
>\(\frac{3}{2}+\frac{1}{4}+\frac{1}{4}+\frac{4}{8}+\frac{4}{8}+..+\frac{32}{64}+\frac{32}{64}\)=\(\frac{3}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}\)>\(4\)
vạyA>4(đpcm)
chứng minh
S=1+1/2+1/3+1/4+...+1/63+1/64 >4
Chứng minh :\(1+\frac{1}{2}+\frac{1}{3}+........+\frac{1}{63}+\frac{1}{64}>4\)
Chứng tỏ: 1+1/2+1/3+1/4+1/5+...+1/63+1/64>4
Chứng minh rằng 1+1/2+1/3+...+1/62+1/63+1/64>4>làm ơn hãy giúp mình.muộn rồi mà mai cô giáo bắt nộp
Chung Minh rang:1+1/2+1/3+1/4+...+1/63 be hon 6
Chứng minh: A= 1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
CHỨNG MINH:
\(\frac{ }{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{63}+\frac{1}{64}>3}\)
giup minh voi:
hay viet 4 phan so lon hon 1/ 3 va be hon 1/2
tim x biet:
( 1/2 +1/3+ 1/4+ 1/5+ 1/6 +1/7)x (2009 * x ) = 0.63* 0.12 - 2,1 * 0,036
so sánh S=1+1/2+1/3+...+1/63+1/64 với 4
