Question

（2012•涼山州）計(jì)算：-12012-|1-

2

cos45°|+

(-2)2

×(

1

2

)-2+(π-1.4)0．

Answer 1

分析：分別根據(jù)有理數(shù)的乘方、絕對(duì)值的性質(zhì)、特殊角的三角函數(shù)值及負(fù)整數(shù)指數(shù)冪、0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=-1-0+2×4+1
=8．

點(diǎn)評(píng)：本題考查的是實(shí)數(shù)的運(yùn)算，熟知有理數(shù)的乘方、絕對(duì)值的性質(zhì)、特殊角的三角函數(shù)值及負(fù)整數(shù)指數(shù)冪、0指數(shù)冪的運(yùn)算是解答此題的關(guān)鍵．