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How to find out the square root and cube root of a number with out a calculator?Give me an easy way.
题目详情
How to find out the square root and cube root of a number with out a calculator?
Give me an easy way.
Give me an easy way.
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答案和解析
我记得上初中的时候,老师曾经教过笔算开平方法求一个数的平方根,（它的原理就是利用平方和公式倒推）,至于手工计算立方根好像没有学过.对于被开方数不大的数有个简便的办法(不借助计算工具）就是手工凑,比如说要求58的平方根,7的平方为49,而8的平方为64,故58的平方根肯定是位于7到8之间,再经过试算,7.6的平方为57.56,而7.7的平方为59.29,可以肯定58的平方根处于7.6到7.7之间,这样凑下去可以得到精确到小数点后面两位数字：7.61
因为英语水平有限,只能用中文解答!
因为英语水平有限,只能用中文解答!
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