Question

計(jì)算：sin²60°-|-1|+(

1

2

)-1．

Answer 1

分析：分別根據(jù)特殊角的三角函數(shù)值、絕對(duì)值的性質(zhì)、負(fù)整數(shù)指數(shù)冪計(jì)算出各數(shù)，再根據(jù)實(shí)數(shù)混合運(yùn)算的法則進(jìn)行計(jì)算即可．

解答：解：原式=（

3

2

）²-1+2
=

3

4

-1+2
=

7

4

．

點(diǎn)評(píng)：本題考查的是實(shí)數(shù)的運(yùn)算，熟知絕對(duì)值的性質(zhì)、負(fù)整數(shù)指數(shù)冪的計(jì)算法則是解答此題的關(guān)鍵．