Question

絕對(duì)值等于它的相反數(shù)的數(shù)一定是

1. A.
   正數(shù)
2. B.
   負(fù)數(shù)
3. C.
   負(fù)數(shù)和零
4. D.
   正數(shù)和零

Answer 1

C
分析：根據(jù)絕對(duì)值的性質(zhì)解答即可．
解答：解：因?yàn)橐粋�(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù)；0的絕對(duì)值是0，0的相反數(shù)也是0，
所以一個(gè)數(shù)的絕對(duì)值等于它的相反數(shù)的數(shù)一定是負(fù)數(shù)或零．
故選C．
點(diǎn)評(píng)：此題考查了絕對(duì)值的性質(zhì)，要求掌握絕對(duì)值的性質(zhì)及其定義，并能熟練運(yùn)用到實(shí)際當(dāng)中．
規(guī)律總結(jié)：一個(gè)正數(shù)的絕對(duì)值是它本身；一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù)；0的絕對(duì)值是0．