Question

實(shí)數(shù)a、b在數(shù)軸上的位置如圖，則化簡(jiǎn)代數(shù)式+a的結(jié)果是        .

Answer 1

b

解析試題分析：根據(jù)數(shù)軸的特征可得，且，再根據(jù)絕對(duì)值的規(guī)律化簡(jiǎn)即可.
由數(shù)軸可得，且
則.
考點(diǎn)：數(shù)軸的知識(shí)，絕對(duì)值的規(guī)律
點(diǎn)評(píng)：解題的關(guān)鍵是熟熟記絕對(duì)值的規(guī)律：正數(shù)和0的絕對(duì)值是它本身，負(fù)數(shù)的絕對(duì)值是它的相反數(shù).