求二元函數f(x,y)=x3+8y3-xy的極值。
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________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
曲線y=|x|與直線y=2所圍成的平面圖形的面積為（）
You________gonow.It’sgettinglate.
