Question

計算：-2^-1+|-2|-3tan30°+（-1）．

Answer 1

【答案】分析：先進(jìn)行開方、負(fù)整數(shù)指數(shù)冪、去絕對值、特殊角的三角函數(shù)值、零指數(shù)冪的計算，最后進(jìn)行實(shí)數(shù)的加減得出結(jié)果．
解答：解：原式=-+2--3×+1                                     
=2-+2--+1
=-+3
=．
點(diǎn)評：本題是一道實(shí)數(shù)的計算題，考查了開方運(yùn)算、負(fù)整數(shù)指數(shù)冪、去絕對值、特殊角的三角函數(shù)值、零指數(shù)冪及實(shí)數(shù)的乘法等運(yùn)算．