Question

計(jì)算：|-2|-4sin45°+（-1）²⁰¹³+．

Answer 1

【答案】分析：本題涉及絕對(duì)值、特殊角的三角函數(shù)值、乘方、二次根式化簡四個(gè)考點(diǎn)．針對(duì)每個(gè)考點(diǎn)分別進(jìn)行計(jì)算，然后根據(jù)實(shí)數(shù)的運(yùn)算法則求得計(jì)算結(jié)果．．
解答：解：|-2|-4sin45°+（-1）²⁰¹³+
=2-4×-1+2
=2-2-1+2
=1．
點(diǎn)評(píng)：本題考查實(shí)數(shù)的綜合運(yùn)算能力，是各地中考題中常見的計(jì)算題型．解決此類題目的關(guān)鍵是熟記特殊角的三角函數(shù)值，熟練掌握絕對(duì)值、乘方、二次根式等考點(diǎn)的運(yùn)算．