2.如圖,點(diǎn)A在數(shù)軸上所對(duì)應(yīng)的數(shù)為-2,點(diǎn)B在點(diǎn)A右邊距A點(diǎn)4個(gè)單位長度.
(1)求點(diǎn)B所對(duì)應(yīng)的數(shù);
(2)點(diǎn)A以每秒2個(gè)單位長度沿?cái)?shù)軸向左運(yùn)動(dòng),同時(shí)點(diǎn)B以每秒2個(gè)單位長度沿?cái)?shù)軸向右運(yùn)動(dòng),當(dāng)點(diǎn)A運(yùn)動(dòng)到-6所在的點(diǎn)處時(shí).
①求A,B兩點(diǎn)間距離;
②現(xiàn)A點(diǎn)靜止不動(dòng),B點(diǎn)再沿?cái)?shù)軸向左運(yùn)動(dòng),經(jīng)過
秒時(shí)A,B兩點(diǎn)相距4個(gè)單位長度.