猜你喜欢
- 1设四面体ABCD的棱长为a,P是棱AB上的任意一点,且P到面ACD,BCD的距离为d1,d2,则d1+d2=?
- 23枝钢笔和2瓶墨水共13元,5枝钢笔和2瓶墨水共19元,买1枝钢笔和1瓶墨水各要用多少钱?
- 3急..已知一条抛物线的形状与抛物线y=-1/4x平方-3相同开口也相同,且顶点坐标为(-2,4)
- 4已知一组数据x1,x2,x3,x4,x5的方差是2,那么数据2x1-3,2x2-3,2x3-3,2x4-3,2x5-3的方差为几
- 5I am going abroad next week
- 6根据首字母及句意用单词的正确形式填空 The baby didn't cry a__ after his mother fed him some milk.
- 7当a=多少时,方程组x+2y-6=0,x-y-9+3a=0的解满足x+y=0
- 8数学的重心和物理的重心有什么区别
- 9他在这条路上跑来跑去,哭着喊救命用英语怎么说:He was running_______________________the path,crying
- 10英语中有哪些单词没有被动语态?