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【简答题】如图所示,以△OAB的顶点O为坐标原点建立平面直角坐标系,A、B的坐标分别为A(-2,-3)、B(2,-1),在网格图中将△OAB作下列变换,画出相应的图形,并写出三个对应顶点的坐标: (1)将△OAB向上平移5个单位,得△O 1 A 1 B 1 ; (2)以点O为位似中心,在x轴的下方将△OAB放大为原来的2倍,得△OA 2 B 2 .