【单选题】A new way of teaching _____ in the article can make learning easier.
【单选题】The colourful illustrations included in the new edition of the book make it______attractive.
【单选题】_______ you start eating in a healthier way, weight control will become much easier.
【单选题】Looking at a situation in a new way will make _______ easier to find new solutions.
【简答题】如图18-1所示,已知二次函数 与x轴分别交于点A(2,0)、 B(4,0),与y轴交于点C(0,-8t)(t>0) 小题1:求a、c的值及抛物线顶点D的坐标(用含t的代数式表示); 小题2:如图18-1,连接AC,将△OAC沿直线AC翻折,若点O的对应点O′恰好落在该抛物线的对称轴上,求实数t的值; 小题3:如图18-2,在正方形EFGH中,点E、F的坐标分别是(4,-4)、(4,-3),边HG...
【简答题】如图1所示,已知二次函数y=ax 2 -6ax+c与x轴分别交于点A(2,0)、B(4,0),与y轴交于点C(0,-8t)(t>0). (1)求a、c的值及抛物线顶点D的坐标(用含t的代数式表示); (2)如图1,连接AC,将△OAC沿直线AC翻折,若点O的对应点O′恰好落在该抛物线的对称轴上,求实数t的值; (3)如图2,在正方形EFGH中,点E、F的坐标分别是(4,-4)、(4,-3),边HG...
【单选题】Beauty has always been regarded as something praiseworthy. Almost everyone thinks attractive people are happier and healthier, have better marriages and have more respectable jobs. Personal advisors g...
【简答题】如图所示,在梯形ABCD中,已知AB∥CD, AD⊥DB,AD=DC=CB,AB=4,以AB所在直线为x轴,过D且垂直于AB的直线为y轴,建立平面直角坐标系。 (1)求∠DAB的度数及A、D、C三点的坐标; (2)求过A、D、C三点的抛物线的解析式及其对称轴L; (3)若P是抛物线的对称轴L上的点,那么使△PDB为等腰三角形的点P有几个?(不必求点P的坐标,只需说明理由)
【简答题】阅读理解。 Beauty has always been regarded as something praiseworthy.Almost everyone thinks attractive people are happier and healthier,have better marriages and have more respectable occupations. Personal...