分析：根據(jù)數(shù)軸上的點(diǎn)平移和其對(duì)應(yīng)的數(shù)的大小變化規(guī)律：左減右加．即可求出答案．由題意得：設(shè)點(diǎn)A對(duì)應(yīng)的數(shù)為x,則點(diǎn)B所對(duì)應(yīng)的數(shù)x-3-2=x-5,又點(diǎn)B所對(duì)應(yīng)的數(shù)和點(diǎn)A對(duì)應(yīng)的數(shù)的絕對(duì)值相等,|x|=|x-5|,解得：x=2.5．本題考查了數(shù)軸和絕對(duì)值的知識(shí),做此題時(shí)要讓學(xué)生結(jié)合數(shù)軸理解這一規(guī)律：數(shù)的大小變化和數(shù)軸上表示這個(gè)數(shù)的點(diǎn)在數(shù)軸上移動(dòng)的關(guān)系：左減右加．給學(xué)生滲透數(shù)形結(jié)合的思想．