Tim GTLN xy(x+4)(y-2 +6x^2+5y^2+24x-10y+2043

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Tim GTLN xy(x+4)(y-2 +6x^2+5y^2+24x-10y+2043

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Sapo 1 year 2020-10-21T02:28:19+00:00 1 Answers 80 views 0

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    2020-10-21T02:29:48+00:00

    `=(x^2+4x)(y^2-2y)+6(x^2+4x)+5(y^2-2y+6)+2013`

    `=(x^2+4x)(y^2-2y+6)+5(y^2-2y+6)+2013`

    `=(x^2+4x+5)(y^2-2y+6)+2013` $\geq$ `1.5 +2013=2018`

    Dấu “=” xảy ra `<=> x=-2; y=1`

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