(2004黑龍江)拋物線，經(jīng)過(guò)A(－1，0)，B(3，0)兩點(diǎn)，則這條拋物線的解析式為_(kāi)_______．

(2004河北)若將二次函數(shù)配方為的形式，則y=________．

(2004貴州貴陽(yáng))拋物線的對(duì)稱軸是________．

(2004錦州)若點(diǎn)A(2，m)在函數(shù)的圖象上，則點(diǎn)A關(guān)于x軸的對(duì)稱點(diǎn)的坐標(biāo)是________．

(2003鹽城)拋物線的頂點(diǎn)坐標(biāo)為_(kāi)_______．

(2002甘肅)二次函數(shù)的圖象如圖所示，則ac________0(填“＞”“＜”“=”)．

(2006長(zhǎng)春，10)函數(shù)的圖象經(jīng)過(guò)點(diǎn)(1，2)，則b－c的值為_(kāi)_______．

(2006江西課改，7)二次函數(shù)的最小值是________．

(2006黑龍江課改，7)請(qǐng)寫(xiě)出一個(gè)開(kāi)口向上，與y軸交點(diǎn)縱坐標(biāo)為－1，且經(jīng)過(guò)點(diǎn)(1，3)的拋物線的解析式________．

(2006，大連)如圖，是二次函數(shù)和一次函數(shù)的圖象，觀察圖象寫(xiě)出時(shí)，x的取值范圍________．