题目：
在平面直角坐标系中，三角形的三个顶点分别是A（2，2），B（4，2），C（4，8），以B为位似中心，按相似比为2：1将△ABC缩小为△A′B′C′，则点A′的坐标为______，点C′的坐标为______．
答案：
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答案：A
在平面直角坐标系中，三角形的三个顶点分别是A（2，2），B（4，2），C（4，8
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