3.2.1 指数概念的扩充 实数指数幂
一、选择题
1.如果word/media/image1_1.png,word/media/image2_1.png都是实数,下列各式错误的是( )
A.word/media/image3_1.png B.word/media/image4_1.png
C.word/media/image5_1.png D.word/media/image6_1.png
2.以下结果中成立,且为最简根式的是( )
A.word/media/image7_1.png
B.word/media/image8_1.png
C.word/media/image9_1.png
D.word/media/image10_1.png
3.以下各式中错误的是( )
A.word/media/image11_1.png·word/media/image12_1.png·word/media/image13_1.png=1( a > 0 )
B.word/media/image14_1.png
C.word/media/image15_1.png
D.word/media/image16_1.png
4.若word/media/image17_1.png,则word/media/image18_1.png的值为( )
A.word/media/image19_1.png B.2或-2
C.-2 D.2
5.化简word/media/image20_1.png的结果是( )
A.word/media/image21_1.png B.word/media/image22_1.png
C.word/media/image23_1.png D.word/media/image24_1.png
二、填空题
6.已知word/media/image25_1.png,则word/media/image26_1.png=________.
7.已知word/media/image27_1.png,则word/media/image28_1.png的值为_____.
三、解答题
8.求值:word/media/image29_1.png.
9.(1998年全国联赛题)已知word/media/image30_1.png,求word/media/image31_1.png的值.
参考答案