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歡迎您訪問(wèn)每日一練:若x2=16,那么5-x的算術(shù)平方根是!

每日一練:若x2=16,那么5-x的算術(shù)平方根是

更新時(shí)間:2024-01-12 12:56:52作者:貝語(yǔ)網(wǎng)校

若x2=16,那么5-x的算術(shù)平方根是

A.±1

B.±4

C.1或9

D.1或3

試題答案

D

試題解析

首先根據(jù)平方根的定義可以求得x,然后利用算術(shù)平方根的定義即可求出結(jié)果.

解答:若x2=16,則x=±4,

那么5-x=1或9,

所以5-x的算術(shù)平方根是1或3.

故選D.

點(diǎn)評(píng):此題主要考查了算術(shù)平方根的性質(zhì),解題關(guān)鍵是了解算術(shù)平方根必須是正數(shù),注意平方根和算術(shù)平方根的區(qū)別.

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