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已知矩形ABCD,边AB=2,AD=1,且AB,AD分别在X轴,Y轴正半轴上.点A与坐标原点重合,将矩形折叠,使点A落在边DC上,设A'点是A落在边DC上的对应点.1.当矩形ABCD沿直线Y=-1/2X+b 折叠时,如图1,求点A'坐标及b值.2. With the earthquake___in the village,many villagers died.A happened B had happened C was happened D happening为什么选D不选A 求解答初中数学的题目,小月和小东在一起探讨有关：多边形内角和”问题,两人互相出题考对方,小月给小东出了一个这样的题目“一个四边形的各内角的度数比为1：2:3:6,求各内角的度数.小 right then与right now有什么区别? refrigerator的中文意思是什么? refrigerator in the refrigerator是什么意思 请问refrigerator refrigerator compressor是什么意思 shipping point与dilivery point 有什么区别 求区别 FOB destination 和 FOB shipping point 和FOB 仨者的含义就是搞不清楚哪里是卖家付钱 哪里是买家付钱 英文书上的写的我看不懂 seller confirms that it understands 日记300字快 Regards, regards什么意思 Who regards his many physical problem as unimportant. where's my water 5-3 ouch,my eye怎么过? You are always in my eyes.Never leave my mind.Just something is different.Just without me的翻译 we are______for Hangzhou tomorrow.为什么是leaving而不是leave? my brother is good at ( ) 完形填空 平行六面体中相对的两个面之间的距离是多少求两平行平面间的距离 根据问句写答句.We should turn right here. We are going the w_____way. We should turn right. because怎么读 because中文怎么读 Because这个单词怎么读? Mary does not has a nice pencil.这句话错在哪 i b---- a nice hat for mary on her bithday 填词 You can't make this stuff up.这句谚语的中文意思是什么?注意：这应该是句谚语.所以请各位高手在翻译时不要仅从字面翻译.除了“你把能把这它压扁.”的本意外应该有其引申义的. there怎么读 ouer there怎么读 there,和 dear怎么读?