212指数函数㈢

2.1.2 指数函数指数函数?9?8?7?6?5?4?3?2?1?-6?-4?-2?2?4?6?8?8?7?6?5?4?3?2?1?-3?-2?0?-1?3?2?1?9?8?7?6?5?4?3?2?1?-6?-4?-2?2?4?6?8?5?4?8?7?6?5?4?3?2?1?-3?-2?0?-1?3?2?1xy21xy21?3.5?3?2.5?2?1.5?1?0.5?-0.5?-3?-2?-1?1?2?3?D121xy121xy?3.5?3?2.5?2?1.5?1?0.5?-0.5?-3?-2?-1?1?2?3?1?1?D练习:1(1)(1)(2)(|)(3)( ) 1(4)( )(5)|( ) 1|(6)()(7)( )f xfxf xf xf xfxfx练习:( )(1)(0,1)xf xabaa13(0,1)xyaaa练习: 例例3 已知已知 xxfx)21121()(（1）求函数）求函数 的定义域；的定义域；（2）判断）判断 的奇偶性。的奇偶性。（3）求证：）求证： 。()0fx( )yf x332( )45xaa( )yf x