摘要：On April1st, Mike decided to play a joke on his friends. He said to Tom, “When I was 51 by Mr. Hill’s room, he was talking with 52 teacher about a test. I think 53 a science test this afternoon. Soon, 54 all the students in Mr. Hill’s science class knew about it. They 55 went into the classroom and began to study. But not Mike. He was 56 at his classmates. When the class began, Mr. Hill said to the students, “Class, we’re going to have a test today. Mike was 57 . He could not believe his 58 . As soon as the class was over, the students were all very 59 to him. But he could only smile. “What a 60 I was! he thought.51.( ) A. going B. coming C. in D. passing
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如图，已知P为∠AOB的边OA上的一点，以P为顶点的∠MPN的两边分别交射线OB于M、N两点，且∠MPN=∠AOB=α（α为锐角）．当∠MPN以点P为旋转中心，PM边与PO重合的位置
开始，按逆时针方向旋转（∠MPN保持不变）时，M、N两点在射线OB上同时以不同的速度向右平行移动．设OM=x，ON=y（y＞x＞0），△POM的面积为S．若sinα=
，OP=2．
（1）当∠MPN旋转30°（即∠OPM=30°）时，求点N移动的距离；
（2）求证：△OPN∽△PMN；
（3）写出y与x之间的关系式；
（4）试写出S随x变化的函数关系式，并确定S的取值范围． 查看习题详情和答案>>
开始，按逆时针方向旋转（∠MPN保持不变）时，M、N两点在射线OB上同时以不同的速度向右平行移动．设OM=x，ON=y（y＞x＞0），△POM的面积为S．若sinα=
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（1）当∠MPN旋转30°（即∠OPM=30°）时，求点N移动的距离；
（2）求证：△OPN∽△PMN；
（3）写出y与x之间的关系式；
（4）试写出S随x变化的函数关系式，并确定S的取值范围． 查看习题详情和答案>>
（2012•济南）如图，∠MON=90°，矩形ABCD的顶点A、B分别在边OM，ON上，当B在边ON上运动时，A随之在边OM上运动，矩形ABCD的形状保持不变，其中AB=2，BC=1，运动过程中，点D到点O的最大距离为（ ）
已知抛物线y=-x2+2mx-m2-m+2．