Question

計(jì)算：+5tan45°．

Answer 1

【答案】分析：分別進(jìn)行二次根式的化簡(jiǎn)、絕對(duì)值、零指數(shù)冪及負(fù)整數(shù)指數(shù)冪的運(yùn)算，然后代入特殊角的三角函數(shù)值即可．
解答：解：原式=-9+3-1+4+5×1+1=3．
點(diǎn)評(píng)：本題考查了實(shí)數(shù)的運(yùn)算，涉及了零指數(shù)冪、負(fù)整數(shù)指數(shù)冪、絕對(duì)值及特殊角的三角函數(shù)值，掌握各部分的運(yùn)算法則是關(guān)鍵．