2019年春七年级数学下册第六章实数章末小结与提升课件(新版)新人教版.pptx

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第六章 实 数,类型1 算术平方根、平方根和立方根的概念,典例1 已知2a-1的立方根是3,42+b-1的算术平方根是6,则a+2b的平方根是 .,【解析】根据题意,得2a-1=27,42+b-1=36,解得a=14,b=-5,则a+2b=14-10=4,4的平方根是2.,【答案】 2,【针对训练】1.若 102.01 =10.1,则 1.0201 = 1.01 . 2.一个正数x的两个平方根分别是2a-1和-a+2. ( 1 )求a和x的值; ( 2 )化简:2|a+ 2 |+|x-2 2 |-|3a+x|.,类型2 算术平方根的非负性,类型4 实数的运算,

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