2. 外语
  3. The figure shows the graph of the equation y = k-x2, where k is a constant. If the area of triangle ABC is 1/8, what is the valu

The figure shows the graph of the equation y = k-x2, where k is a constant. If the area of triangle ABC is 1/8, what is the valu

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问题
The figure shows the graph of the equation y = k-x2, where k is a constant. If the area of triangle ABC is 1/8, what is the value of k? Give your answer to the nearest 0.01.
选项
答案0.25
解析 根据二次函数Y=k-x2，求出A、B、C三点坐标。令x=0，得Y=k，则A点坐标(0，k)，|OA|=k令y=0，得x=，则B点坐标(，0)，C点坐标(，0)，|BC|=。所以三角形面积为；=1/8→k=1/4=0.25。
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