Lisa, could you tell me ________ yesterday? A. what did the teacher say B. what the teacher said C. what will the teacher say D. what the teacher will say
Where do you go when you want to learn something?School?A friend?A tutor?These are all___41__places of learning.But it may well be that the learning you really___42__want somewhere else
过定点
，且与两坐标轴围成三角形面积为
，求直线
或
不垂直于
轴，作
．
得
，令
，得
．
和
．
，
．
时，解得：
无解．
时，解得
或
．
所求直线方程为