分析:根據(jù)二次根式、平方根、立方根的知識逐一進(jìn)行解答.
解答:解:A、因?yàn)?span dealflag="1" class="MathJye" mathtag="math" style="whiteSpace:nowrap;wordSpacing:normal;wordWrap:normal">±
=±0.1,故本選項(xiàng)正確;
B、因?yàn)?span dealflag="1" class="MathJye" mathtag="math" style="whiteSpace:nowrap;wordSpacing:normal;wordWrap:normal">
=1,故本選項(xiàng)錯誤;
C、因?yàn)?
=-(-1)=1,故本選項(xiàng)錯誤;
D、因?yàn)?span dealflag="1" class="MathJye" mathtag="math" style="whiteSpace:nowrap;wordSpacing:normal;wordWrap:normal">
,
無意義,故本選項(xiàng)錯誤.
故選A.
點(diǎn)評:本題考查了實(shí)數(shù)的運(yùn)算,熟悉它們的定義和性質(zhì)是解題的關(guān)鍵.