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小明的作业本上有以下四题:①=4a2;②;③;④,做错的题有[]A.4个B.3个C.2个D.1个-八年级数学
题目简介
化简:。-八年级数学
题目详情
答案
分析:根据立方根的概念即可求解.
解答:解:∵(-2)
∴
故答案为:-2.
点评:此题主要考查了立方根的定义,如果一个数x的立方等于a,即x的三次方等于a(x3=a)那么这个数x就叫做a的立方根,也叫做三次方根.