1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
CMR:M=1+1/2+1/3+..+1/62+1/63+1/64>4
CMR 1+1/2+1/3+...+1/62+1/63+1/64 > 4
cmr:1+1/2+1/3+...+1/62+1/63+1/64>4
Chứng tỏ rằng:
\(1+\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{62}+\dfrac{1}{63}+\dfrac{1}{64}>4\)
bài 1
chứng tỏ rằng
1+1/2+1/3+................1/62+1/63+1/64>4
C/m: 1+ 1/2 + 1/3 + .... + 1/62+1/63 + 1/64 > 4
Các bạn giải chi tiết giúp mik nhé
Chứng minh:S=1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4