【单选题】—What do you think made Mary so upset? —_______ her new bike.
【简答题】证明方程x 3 -5x-2=0只有一个正根,并求此正根的近似值,精确到10 -3 .
【单选题】-What do you think made Mary so upset? -_________ her new bike. [ ]
【单选题】— What do you think made Mary so upset? — ____ her new bike. [ ]
【简答题】Mary made ____a bike. (her)
【简答题】证明:方程x5+x-1=0只有一个正根.
【单选题】用反证法证明“方程 至多有两个解”的假设中,正确的是( )