一個(gè)點(diǎn)從數(shù)軸上的原點(diǎn)開始,先向右移動(dòng)了3個(gè)單位長(zhǎng)度,再向左移動(dòng)5個(gè)單位長(zhǎng)度,可以看到終點(diǎn)對(duì)應(yīng)的數(shù)是-2,已知點(diǎn)A,B是數(shù)軸上的點(diǎn),完成下列各題:
(1)如果點(diǎn)A對(duì)應(yīng)的數(shù)是-3,將點(diǎn)A向右移動(dòng)
個(gè)單位長(zhǎng)度,那么終點(diǎn)B對(duì)應(yīng)的實(shí)數(shù)是
,A,B兩點(diǎn)間的距離是
.
(2)如果點(diǎn)A對(duì)應(yīng)的實(shí)數(shù)是3,將點(diǎn)A向左移動(dòng)
個(gè)單位長(zhǎng)度,再向右移動(dòng)5個(gè)單位長(zhǎng)度,那么終點(diǎn)B對(duì)應(yīng)的實(shí)數(shù)是
,A,B兩點(diǎn)間的距離是
.
(3)一般地,如果點(diǎn)A對(duì)應(yīng)的實(shí)數(shù)為a,將點(diǎn)A向右移動(dòng)b(b>0)個(gè)單位長(zhǎng)度,再向左移動(dòng)c(c>0)個(gè)單位長(zhǎng)度,那么終點(diǎn)B對(duì)應(yīng)的實(shí)數(shù)是
,A,B兩點(diǎn)間的距離是
.