Các câu hỏi tương tự
1/41+1/42+1/43+...+1/79 va 7/12( So sanh )
lam nhanh minh tick cho5 cai nha
Chứng minh rằng: 1/41+1/42+1/43+..........+1/79+1/80>7/12
A=1\41+1\42+1\43+...+1\79+1\80.chung minh A >7\12
Chững minh rằng : 1/41 + 1/42 + 1/43 +... + 1/79 + 1/80 > 7/12
Chứng minh rằng :
1/41 + 1/42 + 1/43 + ... + 1/79 + 1/80 > 7/12
chứng minh rằng:
1/41+1/42+1/43+.....+1/79+1/80 >7/12
Cmr 1/41+4/42+4/43+.........+1/79+1/80>7/12
Chứng minh
\(\frac{1}{41}+\frac{1}{42}+\frac{1}{43}+\frac{1}{44}+........................+\frac{1}{78}+\frac{1}{79}+\frac{1}{80}< \frac{1}{2}\)
Giúp mình nhé ai nhanh nhất mình tick
Chứng minh rằng
a) 1/2 + 1/3 + 1/4 +...+1/63 > 2
b) 1/41 + 1/42 + 1/43 +...+1/79 + 1/80 > 7/12