的焦点坐标为 ．相关试题
(－
<x<
，则扇形面积的最大值是______。在平面直角坐标系中, 点集A="{(x," y)| 
}, 点集B="{(x," y)| 
, 则点集M="{(x," y)|x=x
+x
, y=y+y, (x, y)
A, (x, y)B}所表示的区域的面积为_____________.
有一正一负根的充要条件是a
______．推荐套卷
在平面直角坐标系中, 点集A="{(x," y)| }, 点集B="{(x," y)| , 则点集M="{(x," y)|x=x+x, y=y+y, (x, y)A, (x, y)B}所表示的区域的面积为_____________.
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