2. 外语
  3. Points (-2, x)and(y, 2), not shown in the figure above, are in quadrants Ⅲ and Ⅱ, respectively, in which quadrant is point(x, y)

Points (-2, x)and(y, 2), not shown in the figure above, are in quadrants Ⅲ and Ⅱ, respectively, in which quadrant is point(x, y)

admin2022-11-09  28
问题 Points (-2, x)and(y, 2), not shown in the figure above, are in quadrants Ⅲ and Ⅱ, respectively, in which quadrant is point(x, y)?
选项 A、Ⅰ
B、Ⅱ
C、Ⅲ
D、Ⅳ
E、It cannot be determined from the information given.
答案C
解析 (-2，x)在第三象限，那么x就绝对不可能为0，x必然小于0；同样道理，(y，2)在第二象限，那么y必然小于0，所以(x，y)一定在第三象限。正确答案为C。
坐标系中任意两点间的距离：
P2P1=
连接任意两点的线段的中点坐标：
(xm，ym)=
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