1.數(shù)軸上兩點(diǎn)間的距離等于這兩點(diǎn)所對(duì)應(yīng)的數(shù)的差的絕對(duì)值.例:如圖所示,點(diǎn)A、B在數(shù)軸上分別對(duì)應(yīng)的數(shù)為a、b,則A、B兩點(diǎn)間的距離表示為AB=|a-b|.
根據(jù)以上知識(shí)解題:
點(diǎn)A在數(shù)軸上對(duì)應(yīng)的數(shù)為a,點(diǎn)B對(duì)應(yīng)的數(shù)為b,且a,b滿足|a+2|+(b-3)
2=0.
(1)①點(diǎn)A對(duì)應(yīng)的數(shù)為
,點(diǎn)B對(duì)應(yīng)的數(shù)為
;
②若x為數(shù)軸上任意一點(diǎn),則|x-b|+|x-a|的最小值為
;
(2)點(diǎn)C在數(shù)軸上對(duì)應(yīng)的數(shù)為x,且x是方程
的解.
①求B、C兩點(diǎn)間的距離;
②若將數(shù)軸折疊,使得A點(diǎn)與C點(diǎn)重合,則與B點(diǎn)重合的點(diǎn)對(duì)應(yīng)的數(shù)是
;
③在數(shù)軸上是否存在點(diǎn)P,使PA+PB=BC?若存在,求出點(diǎn)P對(duì)應(yīng)的數(shù);若不存在,請(qǐng)說(shuō)明理由.