27.在平面直角坐標(biāo)系xOy中,若點(diǎn)P和點(diǎn)P
1關(guān)于y軸對(duì)稱(chēng),點(diǎn)P
1和點(diǎn)P
2關(guān)于直線(xiàn)l對(duì)稱(chēng),則稱(chēng)點(diǎn)P
2是點(diǎn)P關(guān)于y軸、直線(xiàn)l的“二次對(duì)稱(chēng)點(diǎn)”.
(1)已知點(diǎn)A(3,5),直線(xiàn)l是經(jīng)過(guò)(0,2)且平行于x軸的一條直線(xiàn),則點(diǎn)A″為點(diǎn)A關(guān)于y軸,直線(xiàn)l的“二次對(duì)稱(chēng)點(diǎn)”,則點(diǎn)A″的坐標(biāo)為
;
(2)如圖1,正方形ABCD的頂點(diǎn)坐標(biāo)分別是A(0,1),B(0,3),C(2,3),D(2,1);點(diǎn)E的坐標(biāo)為(1,1),若點(diǎn)M為正方形ABCD(不含邊界)內(nèi)一點(diǎn),點(diǎn)M′為點(diǎn)M關(guān)于y軸,直線(xiàn)OE的“二次對(duì)稱(chēng)點(diǎn)”,則點(diǎn)M′的橫坐標(biāo)x的取值范圍是
;
(3)如圖2,T(t,0)(t≥0)是x軸上的動(dòng)點(diǎn),線(xiàn)段RS經(jīng)過(guò)點(diǎn)T,且點(diǎn)R、點(diǎn)S的坐標(biāo)分別是R(t,1),S(t,-1),直線(xiàn)l經(jīng)過(guò)(0,1)且與x軸夾角為60°,在點(diǎn)T的運(yùn)動(dòng)過(guò)程中,若線(xiàn)段RS上存在點(diǎn)N,使得點(diǎn)N′是點(diǎn)N關(guān)于y軸,直線(xiàn)l的“二次對(duì)稱(chēng)點(diǎn)”,且點(diǎn)N′在y軸上,則點(diǎn)N′縱坐標(biāo)y的取值范圍是
.