Question

9．-$\sqrt{2}$的絕對值是$\sqrt{2}$，相反數(shù)是$\sqrt{2}$，倒數(shù)是-$\frac{\sqrt{2}}{2}$．

Answer 1

分析 根據(jù)負(fù)數(shù)的絕對值是它的相反數(shù)，乘積為1的兩個數(shù)互為倒數(shù)，可得答案．

解答 解：-$\sqrt{2}$的絕對值是 $\sqrt{2}$，相反數(shù)是 $\sqrt{2}$，倒數(shù)是-$\frac{\sqrt{2}}{2}$，
故答案為：$\sqrt{2}$，$\sqrt{2}$，-$\frac{\sqrt{2}}{2}$．

點評 本題考查了實數(shù)的性質(zhì)，熟記絕對值的性質(zhì)是解題關(guān)鍵．