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1、对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于
2、闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have一、复习
3、：(1) 平方根的概念?如何用符号表示数a(0)的平方根?(2)正数有几个平方根?它们之间的关系是什么?负数有没 有平方根?0平方根是什么?1.口答：2.计算：对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds
4、the partitioned matrix, prove that when satisfy the certain condition, we have这是由几个大小相同 的单位立方体组成的 魔方?这是什么对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementa
5、ry operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have1.要做一个体积为27立方厘米的立方体模 型,它的棱要多少长？ 你是怎么知道的?2.什么数的立方等于-27？对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current rese
6、arch key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have 1.立方根的概念：数a的立方根用符号“ ”表示，读作“三次根号a” .2.开立方：求一个数的立方根的运算，叫做开立方.开立方与立方也是互为逆运算，因此求一个数的 立方根可以通过立方运算来求.一般地，如果一个数的立方等于a，这个数就叫做a的立 方根(也叫做三次方根). 即X X3=a a,
7、把X X叫做a a的立方根立方根。如53=125125 则把5 5叫做125125的立方根 （-5）3=-125125 则把-5 5叫做-125125的立方根对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds t
8、he partitioned matrix, prove that when satisfy the certain condition, we have例例1 1、求下列各数的立方根：、求下列各数的立方根：（1 1）-8 （2 2）8 （3 3）（4 4）0.216 (5) (5) 0解：(1) （-2)3=-8 -8的立方根是-2即(2) 23=8 8的立方根是2即(3) 即(4) 0.63=0.216 0.216的立方根是0.6即(5) 03=0 0的立方根是0即对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人
9、一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have1 1、正数有一个正的立方根、正数有一个正的立方根2 2、负数有一个负的立方根、负数有一个负的立方根3 3、0 0的立方根还是的立
10、方根还是0 0你能根据平方根的性质归纳出立方根的性质吗？想一想：平方根是本身的数有哪些？0立方根的性质立方根的性质：平方根的性质：平方根的性质：一个正数有正、负两一个正数有正、负两 个平方根，它们互为个平方根，它们互为 相反数；零的平方根相反数；零的平方根 是零，负数没有平方是零，负数没有平方 根。根。算术平方根是本身的呢？0，1 立方根是本身的呢？0，1，-1对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what cond
11、ition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have练一练 1.判断下列说法是否正确,并说明理由。(1) x(2) 25的平方根是5x(3) -64没有立方根x(4) -4的平方根是x(5) 0的平方根和立方根都是0对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅
12、仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have 例例2 2、求下例各式的值：、求下例各式的值：（1）（3）（2）解：解：（1
13、1）（2 2）（3 3）（4）（4）= - 4 + 4=0对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the
14、 certain condition, we have课堂练习：求下列各式的值：课堂练习：求下列各式的值：= -0.1=6对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned mat
15、rix, prove that when satisfy the certain condition, we have1、通过本节课的学习你获得了那些知识？2、你能总结出平方根和立方根的异同点吗？ 相同点: 0的平方根、立方根都有一个是0平方根、立方根都是开方的结果。不同点： 定义不同。个数不同。表示方法不同。被开方数的取值范围不同。对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the c
16、urrent research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have作业 （1）课内：P9 9 2，410 2，4（2）书本作业题P9P10（做在书 本上）对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation
