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1、名师精编优秀教案八年级数学学教案课题:17.2 立方根学习目标1知识目标(1)了解立方根的定义.会表示一个数的立方根.(2)了解开立方与立方是互逆的运算,会求一个数的立方根.2能力目标会求一个数的立方根.3情感目标发展求同存异思维学习重点、难点重点:立方根的定义、表示方法、性质、开立方.难点:立方根的性质.节前预习1.填空(1)43=(),34=(),()3=64(2)332=(),332=(),()3=278,(3)03=(),()3=0(4)若 x3=8 则 x=,若 x3=8 则 x=,若 x3=0 则 x=2.一个数和它的立方是一一对应的吗?3.立方根的定义:一般地,如果一个数x 的立
2、方等于a,即 x3=a,那么这个数x 就叫做a的或 .如 64 的立方根是 ,-64的立方根是 ,0的立方根是 .学习过程情境创设,引入新知同学们我们已经会求一个非负数的平方根了,如果已知某个数的立方,那么如何求出这个数呢?、合作探究新知一起探究:53=125,是的立方根,321=81,是的立方根,8)2(3,是的立方根,321=81是的立方根,03=,0 是的立方根问题:1.一个正数有两个平方根,它们互为相反数.一个正数有几个立方根?2.负数没有平方根.负数有立方根吗?如果有,一个负数有几个立方根?备注名师精编优秀教案3.0 的立方根是什么数?归纳:立方根的性质一个正数有一个正的立方根一个负
3、数有一个负的立方根0 的立方根是0 小组交流:1.立方根的表示:数a 的立方根用符号表示,读作,其中 a 是数.、2.开立方:求一个数的的运算,叫做开立方.开 3.立方与互为逆运算。自我展示1.求下列各数的立方根:(1)8(2)278解:(1)(2)3=-8 8 的立方根是 2,即38=-2(3)0.125(4)0 归纳:如果a大于 0,那么3a=3a这样,求一个负数的立方根,可以先求这个负数的绝对值的立方根,再取它的相反数.2.求下列各式的值(1)327(2)327(3)1000(4)3343.0 (5)36427(6)327102解:(1)327=333=3(2)327=333=3 或32
4、7=327=333=3(3)1000=(4)3343.0=(5)36427=文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1
5、P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档
6、编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1
7、P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档
8、编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1
9、P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档
10、编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5名师精编优秀教案(6)327102=基础练习1、填空如果 x3=a,叫做的立方根。43=,4 是的立方根,用含根式的式子表示为(4)3=,4是的立方根,用含根式的式子表示为。81的立方根是立方根等于自身的数一共有个,它们是3a与3a的关系。2下列各说法对不对?对打,错打,并把错误改正
11、。(1)0.064 的立方根是0.4()改正:(2)8 的立方根是2 ()改正:(3)271的立方根是31()改正:(4)161的立方根是41()改正:3.求下列各数的立方根:(1)81(2)0.008 (3)6427(4)85154.求下列各式的值(1)3100027=(2)33438=(3)3187=(4)3729=能力创新求下列各式中的x 1)x30.008 2)64x31250 3)x3383 4)(x1)3 1 课堂小结1.立方根定义:2.立方根性质:文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H
12、2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU
13、6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H
14、2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU
15、6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H
16、2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU
17、6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H
18、2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5名师精编优秀教案3.开立方:求一个数的立方根的运算,叫做开立方.4.完成表格平方根的个数平方根的符号立方根的个数立方根的符号正数0 负数课后作业课本 101 页习题 3 题,4 题.文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6
19、X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1
20、 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6
21、X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1
22、 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6
23、X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5文档编码:CU6J1X9C3L1 HJ1U1P6I2H2 ZI1X1P6X8M5
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