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Chứng tỏ rằng: 1/41+1/42+1/43+...+1/79+1/80>7/12
chứng tỏ rằng :1 /41 +1/42 +1/43 +...+1/79+1/80 >7/12
chứng tỏ rằng:
1/41+1/42+1/43+.....+1/79+1/80>7/12
chứng tỏ 1/41+1/42+1/43+.......+1/79+1/80>7/12
Chứng tỏ rằng: \(\frac{1}{41}+\frac{1}{42}+\frac{1}{43}+...+\frac{1}{79}+\frac{1}{80}>\frac{7}{12}\)
CHỨNG TỎ
1/41 + 1/42 + 1/43 + ... + 1/79 +1/80 <7/12
a, cho A = 9999931999 - 5555571997
Chứng minh rằng A chia hết cho 5
b, Chứng tỏ rằng :
\(\dfrac{1}{41}+\dfrac{1}{42}+\dfrac{1}{43}+....+\dfrac{1}{79}+\dfrac{1}{80}\) >\(\dfrac{7}{12}\)
Cho A = 1/41+1/42+1/43+...+1/78+1/79+1/80. Chứng tỏ: A > 7/12
Chứng tỏ rằng :\(y=\frac{1}{41}+\frac{1}{42}+\frac{1}{43}+...+\frac{1}{79}+\frac{1}{80}>\frac{7}{12}\)