26.新定義:在平面直角坐標(biāo)系中,過某一點(diǎn)分別作坐標(biāo)軸的垂線,若與坐標(biāo)軸圍成的長(zhǎng)方形的周長(zhǎng)與面積數(shù)值相等,則這個(gè)點(diǎn)叫做“恒等點(diǎn)”.例如,如圖①,②,過點(diǎn)P分別作x軸、y軸的垂線,與坐標(biāo)軸圍成長(zhǎng)方形OAPB的周長(zhǎng)與面積數(shù)值相等,則點(diǎn)P是“恒等點(diǎn)”.
(1)點(diǎn)M(1,2)
“恒等點(diǎn)”(填“是”或“不是”).
(2)點(diǎn)N(-4,n)是“恒等點(diǎn)”,求n的值.
(3)如圖②,點(diǎn)E是線段PB上一點(diǎn),連接OE并延長(zhǎng)交AP的延長(zhǎng)線于點(diǎn)Q,若“恒等點(diǎn)”P(a,3),a是正數(shù),且S
△OBE=3+S
△EPQ,求點(diǎn)Q的坐標(biāo).