七年级数学上册第二章有理数2.15用计算器进行计算同步课件(新版)华东师大版.ppt

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1、2.15 用计算器进行计算,这节课我们介绍如何利用计算器进行数的简单运算.,操作探索,问题,已知一个圆柱的底面半径长2.32cm,高为7.06cm,求这个圆柱的体积.,我们知道,圆柱的体积底面积高.因此,计算这个圆柱的体积就要做一个较复杂的运算:,碰到复杂的计算,我们可以利用电子计算器(简称计算器)来完成.,再按下列顺序依次按键:,例1: 用计算器求34521.3.,解: 用计算器求34521.3的过程为:,显示器显示运算式为345+21.3,在第二行显示运算结果366.3,所以 34521.3366.3.,做一做:,按例1的方法,用计算器求105.3243.,显示结果为:78,所以 31.2

2、0.4)78.,做一做: 按例2的方法,用计算器求8.2(4.3) 2.5.,注意:,(1) 输入0.4时可以省去小数点前的0,按成 . 4 。,这是减法和乘法的混合运算.对于加、减、乘、除法和乘方的混合运算.只要按算式的书写顺序输入,计算器会按要求算出结果.因此,本题的按键顺序是:,显示结果为:93.4,所以, 62.24(7.8)93.4.,做一做:,按例3的方法,用计算器求(59)24.2(7).,显示结果为:19.683,3,例4. 用计算器求2.7,用计算器求一个数的正整数次幂,不同的计算器会有不同的按键方式.,若求一个数的平方,不少计算器都有专用键.,1.用计算器求下列各式的值:

3、1)27308; (2)0.7532.04; (3)3.6572.7; (4)97.934.8;,(5)43(28); (6)0.14763; (7)36125; (8)84(24);,(9)76(0.19); (10)(0.125) (18); (11)83139328512; (12)3.145.767.19;,(13)2.576(0.19); (14)1250.42(7); (15)38915.23(结果保留三位有效数字).,2.用计算器求下列各式的值:,(1)23154; (2)502203; (3)2532(127); (4);0.8440.792,【答案】(1)349;(2)35;(3)23;(4)1.79;(5)28(6)5.832;(7)0.00020736;(8)86.49;(9)15625;(10)2187.,3.用计算器求下列各式的值:,【答案】(1)73.2;(2)63075;(3)50,小结:,通过我们这一节课的探索与学习,你一定有好多的收获,你能把这些知识点加以收集与总结吗?,谢谢观看!,

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