Question

CMR: \(\left(a-\frac{1}{b}\right)\left(b-\frac{1}{c}\right)\left(c-\frac{1}{a}\right)\ge\left(a-\frac{1}{a}\right)\left(b-\frac{1}{b}\right)\left(c-\frac{1}{c}\right)\)trong đó \(a,b,c\ge1\)

Answer 1

a⁵  + b⁵ + c⁵ 

= ( a+b+c )⁵ 

^{= 0 chia het cho 30}

Answer 2

Ta có :\(\left(a-\frac{1}{b}\right)\left(b-\frac{1}{c}\right)\left(c-\frac{1}{a}\right)\)

\(=\frac{ab-1}{b}.\frac{bc-1}{c}.\frac{ac-1}{a}\)

Ta lại có : \(\left(a-\frac{1}{a}\right)\left(b-\frac{1}{b}\right)\left(c-\frac{1}{c}\right)\)

\(=\frac{a^2-1}{a}.\frac{b^2-1}{b}.\frac{c^2-1}{c}\)

Answer 3

Xin loi minh lam sai