Cho S= 1/31 + 1/32 + 1/33 +....+ 1/59 + 1/60. CMR 3/5<S<4/5
CMR: 31/2*32/2*33/2*...*60/2=1*3*5*...*59
tính:1/31+1/32+1/33+...+1/59+1/60
Cho S=1/31+1/32+1/33+...+1/59+1/60 Chứng minh 3/5<S<4/5
Cho S=1/31+1/32+1/33+.........+1/59+1/60. C/m 3/5<S<4/5
chứng minh 31/2 X 32/2 X 33/2 ...60/2 = 1 X 3 X 5 ...X 59
Cho S=1/31+1/32+1/33+...+1/59+1/60 Chứng minh
3/5<S<4/5
Chứng tỏ : 31/2 x 32/2 x 33/2 x .... x 60/2 = 1 x 3 x 5 x ... x 59
chứng tỏ rằng :
31 / 2 x 32 / 2 x 33 / 2... x 60 / 2 = 1 x 3 x 5 ... x 59