cho $a, b, c$ $\in$ R+ thỏa mãn $abc=1$. CMR:
$(a-1+\frac{1}{b})(b-1+\frac{1}{c})(c-1+\frac{1}{a})\leq 1$
nhân tiện ai có đề thi HSG toán 10 nào hay hay chia sẻ với mình nhé...cảm ơn trước!!!
Vì $abc=1$. Đặt $a=\frac{x}{y};b=\frac{y}{z};c=\frac{z}{x};x,y,z>0$
Đpcm$\Leftrightarrow$$(\frac{x}{y}+\frac{z}{y}-1)(\frac{y}{z}+\frac{x}{z}-1)(\frac{z}{x}+\frac{y}{x}-1)\leq1$
$\Leftrightarrow$$(x+z-y)(y+x-z)(z+y-x)\leq xyz$(1)
Dễ dàng CM BĐT (1) luôn đúng$\Rightarrow$đpcm
Dấu''='' xra$\Leftrightarrow$a=b=c=1

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