Question

已知=5.225，那么下列結(jié)論正確的是

1. A.
   =0.5225
2. B.
   =52.25
3. C.
   =0.5225
4. D.
   =522.5

Answer 1

C
分析：根據(jù)小數(shù)點(diǎn)的運(yùn)動(dòng)規(guī)律，被開(kāi)方數(shù)的小數(shù)點(diǎn)每向左或右移動(dòng)兩位，算術(shù)平方根的小數(shù)點(diǎn)就相應(yīng)的向左或右移動(dòng)一位．
解答：∵=5.225，∴A、B一定錯(cuò)誤；
D應(yīng)等于52.25，
C正確，
故選C．
點(diǎn)評(píng)：本題考查了算術(shù)平方根以及小數(shù)點(diǎn)的移動(dòng)規(guī)律，注：被開(kāi)方數(shù)的小數(shù)點(diǎn)每向左或右移動(dòng)兩位，算術(shù)平方根的小數(shù)點(diǎn)就相應(yīng)的向左或右移動(dòng)一位．