23.如圖,已知點(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+3|+(b-2)
2=0.
(1)求A、B所表示的數(shù);
(2)點(diǎn)C在數(shù)軸上對(duì)應(yīng)的數(shù)為x,且x是方程2x+1=
x-8的解.
①求線段BC的長(zhǎng);
②在數(shù)軸上是否存在點(diǎn)P,使PA+PB=BC?求出點(diǎn)P對(duì)應(yīng)的數(shù);若不存在,說(shuō)明理由.