Question

Cho 6 số nguyên dương a<b<c<d<m<n. Chứng minh rằng : \(\frac{a+c+m}{a+b+c+d++m+n}< \frac{1}{2}\)

Answer 1

Do a < b < c < d < m < n

=> a + c + m < b + d + n

=> 2 × (a + c + m) < a + b + c + d + m + n

=> a + c + m / a + b + c + d + m + n < 1/2 ( đpcm)

Answer 2

Do a < b < c < d < m < n

=> a + c + m < b + d + n

=> 2 × (a + c + m) < a + b + c + d + m + n

=> a + c + m / a + b + c + d + m + n < 1/2 ( đpcm)

Answer 3

Do a<b<c<d<m<n

\(\Rightarrow\)a+c+m<b+d+n

\(\Rightarrow\)2(a+c+m) < a+b+c+d+m+n

\(\Rightarrow\)\(\frac{2\left(a+c+m\right)}{a+b+c+d+m+n}< 1\Rightarrow\frac{a+c+m}{a+b+c+d+m+n}< \frac{1}{2}\)

k cho mình nha