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因為2x+y=1 1/x+1/y=(2x+y)(1/x+1/y) =2+(y/x)+(2x/y)+1 =3+[(y/x)+(2x/y)] ≥3+2√[(y/x)(2x/y)] =3+2√2 當且僅當y/x=2x/y時,原式有最小值3+2√2 此時可求得x=?y=?(麻煩自己求一下啦,記住x,y屬於R+,)
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