2.在一條不完整的數(shù)軸上從左到右有點(diǎn)A、B、C,其中點(diǎn)A到點(diǎn)B的距離為3,點(diǎn)C到點(diǎn)B的距離為7,如圖所示,設(shè)點(diǎn)A、B、C所對(duì)應(yīng)的數(shù)的和是m.
(1)若點(diǎn)B為原點(diǎn),則點(diǎn)A、點(diǎn)C所對(duì)應(yīng)的數(shù)分別是
.
(2)若數(shù)軸的原點(diǎn)為O,且點(diǎn)B到原點(diǎn)O的距離為4,求m的值.