26.在平面直角坐標(biāo)系xOy中,已知點(diǎn)M(a,b),對(duì)于點(diǎn)P(c,d)給出如下定義:將點(diǎn)P向右(a≥0)或向左(a<0)平移|a|個(gè)單位長度,再向上(b≥0)或向下(b<0)平移|b|個(gè)單位長度,得到點(diǎn)P',點(diǎn)P'??與點(diǎn)M的中點(diǎn)為Q,稱點(diǎn)Q為點(diǎn)P的關(guān)于點(diǎn)M的“平移中點(diǎn)”.
(1)已知點(diǎn)M(-3,1).
①若點(diǎn)P(1,1),則點(diǎn)Q的坐標(biāo)是
;
②若點(diǎn)P在直線l:y=3x上運(yùn)動(dòng),當(dāng)點(diǎn)Q在第二象限時(shí),求點(diǎn)P的橫坐標(biāo)c的取值范圍.
(2)已知菱形ABCD的頂點(diǎn)A,B,C,D的坐標(biāo)分別是(2,3),(3,1),(4,3),(3,5),點(diǎn)P(c,d)是菱形ABCD上的動(dòng)點(diǎn).當(dāng)點(diǎn)M(a,b)在直線l:y=3x上運(yùn)動(dòng)過程中,若存在點(diǎn)Q在菱形ABCD的邊上或者內(nèi)部,直接寫出a的取值范圍.