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1、 2.1.1 指数与指数幂的运算知识点：n次方根的概念1、下列各式正确的是()A.=a B.a0=1 C.=-4 D.=-3 2、若 x4=81,则下列说法正确的个数是()x 是 81 的四次方根;x=3;x=3;x=-3.A.0 B.2 C.3 D.1 知识点：根式的概念和运算性质3、若=-,则()A.a=0 B.a0 C.a0 D.a0 4、(2015南昌高一检测)化简-得()A.6 B.2x C.6 或-2x D.-2x 或 6 或 2 5、(2015吉林高一检测)化简+=.6、若+=0,则 x2015+y2016=.7、若+=0,则 x2015+y2016=.8、(10 分)化简:(1
2、)蟺(x0.5 D.x0,化简-=.18、已知+=3,求下列各式的值:(1)a+a-1.(2)a2+a-2.【参考答案】1【解析】选D.对于 A,因为 a 的正负不确定,所以=|a|.对于 B要求 a0.对于 C结果应为4,故只有 D正确.2【解析】选B.因为 x4=81,所以 x 是 81 的四次方根且x=3.3【解析】选A.=-,是一个数与其相反数相等,故 a=0.4【解析】选C.原式=|x+3|-(x-3)=文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X
3、6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S
4、7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5
5、V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF
6、9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM
7、8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6
8、L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:
9、CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C85【解析】+=(1+)+|1-|=1+-1=2.答案:26【解析】因为+=0,所以 x-1=0 且 x+y=0,解得 x=1 且 y=-1,所以 x2015+y2016=1+1=2.答案:2 7【解析】因为+=0,即+=0,所以x+1=0 且x-y=0,解得 x=-1 且 y=-1,所以 x2015+y2016=-1+1=0.答案:0 8【解析】(1)因为 x,所以 x-0,解得 x0,所以-=-=4.答案:4 18【解析】(1)因为+=3,
10、所以(+)2=a+a-1+2=9,所以 a+a-1=7.(2)因为 a+a-1=7,所以(a+a-1)2=a2+a-2+2=49,所以 a2+a-2=47.文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8
11、 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4
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15、4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8文档编码:CF9X6C7F10T8 HM8S7W1Z7A4 ZI6L5V8Q4C8