在长方形ABCD中，AB=20cm，BC=12cm．（1）以A为原点，AB所在直线为x轴，AD所在直线为y轴建立平面直角坐标
推荐回答（1个）
（1）如图，A（0，0），B（20，0），C（20，12），D（0，12）；
（2）2×2=4cm，
所以，A 1 （4，0），B 1 （24，0），C 1 （24，12），D 1 （4，12）；
（3）平移后重叠部分的矩形的长为24÷12=2cm，
所以，平移距离为20-2=18cm，
时间=18÷2=9秒．
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