3.如圖,△ABC的頂點(diǎn)A、B、C都在小正方形的頂點(diǎn)上.
(1)請(qǐng)利用網(wǎng)格線畫(huà)出△A′B′C′,使它與△ABC關(guān)于y軸成軸對(duì)稱,其中點(diǎn)A的對(duì)稱點(diǎn)為A′,點(diǎn)B的對(duì)稱點(diǎn)為B′,點(diǎn)C的對(duì)稱點(diǎn)為C′,并寫(xiě)出A′,B′,C′三點(diǎn)的坐標(biāo);
(2)在y軸上存在一點(diǎn)P,使得AP+BP最小,在圖中畫(huà)出點(diǎn)P的位置;
(3)已知線段BC經(jīng)過(guò)點(diǎn)(3,0),在y軸上存在一點(diǎn)Q,點(diǎn)Q到邊AC、BC的距離相等,請(qǐng)直接寫(xiě)出Q點(diǎn)坐標(biāo).