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專題16函數(shù)的圖像變換問(wèn)題函數(shù)圖像的變換問(wèn)題的考查一般難度較大,但關(guān)鍵是要理清圖像變換前后的解析式的關(guān)系,圖像變換的規(guī)律以二次函數(shù)為例:1.保持y=ax2的形狀不變,將其頂點(diǎn)平移到(h,k)處,具體平移方法如下:2.二次函數(shù)平移遵循“上加下減,左加右減”的原則,據(jù)此,可以直接由解析式中常數(shù)的加或減求出變化后的解析式;二次函數(shù)圖象的平移可看作頂點(diǎn)間的平移,可根據(jù)頂點(diǎn)之間的平移求出變化后的解析式. (2022·湖北恩施·統(tǒng)考中考真題)在平面直角坐標(biāo)系中,O為坐標(biāo)原點(diǎn),拋物線SKIPIF1<0與y軸交于點(diǎn)SKIPIF1<0.(1)直接寫出拋物線的解析式.(2)如圖,將拋物線SKIPIF1<0向左平移1個(gè)單位長(zhǎng)度,記平移后的拋物線頂點(diǎn)為Q,平移后的拋物線與x軸交于A、B兩點(diǎn)(點(diǎn)A在點(diǎn)B的右側(cè)),與y軸交于點(diǎn)C.判斷以B、C、Q三點(diǎn)為頂點(diǎn)的三角形是否為直角三角形,并說(shuō)明理由.(3)直線BC與拋物線SKIPIF1<0交于M、N兩點(diǎn)(點(diǎn)N在點(diǎn)M的右側(cè)),請(qǐng)?zhí)骄吭趚軸上是否存在點(diǎn)T,使得以B、N、T三點(diǎn)為頂點(diǎn)的三角形與SKIPIF1<0相似,若存在,請(qǐng)求出點(diǎn)T的坐標(biāo);若不存在,請(qǐng)說(shuō)明理由.(4)若將拋物線SKIPIF1<0進(jìn)行適當(dāng)?shù)钠揭疲?dāng)平移后的拋物線與直線BC最多只有一個(gè)公共點(diǎn)時(shí),請(qǐng)直接寫出拋物線SKIPIF1<0平移的最短距離并求出此時(shí)拋物線的頂點(diǎn)坐標(biāo).(1)待定系數(shù)法求二次函數(shù)解析式;(2)分別求得B、C、Q的坐標(biāo),勾股定理的逆定理驗(yàn)證即可求解;(3)由SKIPIF1<0,故分兩種情況討論,根據(jù)相似三角形的性質(zhì)與判定即可求解;(4)如圖,作SKIPIF1<0且與拋物線只有1個(gè)交點(diǎn),交SKIPIF1<0軸于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0于點(diǎn)SKIPIF1<0,則SKIPIF1<0是等腰直角三角形,作SKIPIF1<0于SKIPIF1<0,進(jìn)而求得直線SKIPIF1<0與SKIPIF1<0的距離,即為所求最短距離,進(jìn)而求得平移方式,將頂點(diǎn)坐標(biāo)平移即可求解.【答案】(1)SKIPIF1<0(2)以B、C、Q三點(diǎn)為頂點(diǎn)的三角形是直角三角形,理由見解析(3)存在,SKIPIF1<0或SKIPIF1<0,(4)最短距離為SKIPIF1<0,平移后的頂點(diǎn)坐標(biāo)為SKIPIF1<0【詳解】(1)解:∵拋物線SKIPIF1<0與y軸交于點(diǎn)SKIPIF1<0∴SKIPIF1<0SKIPIF1<0拋物線解析式為SKIPIF1<0(2)以B、C、Q三點(diǎn)為頂點(diǎn)的三角形是直角三角形,理由如下:SKIPIF1<0SKIPIF1<0的頂點(diǎn)坐標(biāo)為SKIPIF1<0依題意得,SKIPIF1<0SKIPIF1<0平移后的拋物線解析式為SKIPIF1<0令SKIPIF1<0,解SKIPIF1<0得SKIPIF1<0SKIPIF1<0令SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0以B、C、Q三點(diǎn)為頂點(diǎn)的三角形是直角三角形(3)存在,SKIPIF1<0或SKIPIF1<0,理由如下,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0是等腰直角三角形設(shè)直線SKIPIF1<0的解析式為SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0直線SKIPIF1<0的解析式為SKIPIF1<0,聯(lián)立SKIPIF1<0解得SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是等腰直角三角形SKIPIF1<0SKIPIF1<0,SKIPIF1<0設(shè)直線SKIPIF1<0的解析式為SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0直線SKIPIF1<0的解析式為SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0設(shè)SKIPIF1<0的解析式為SKIPIF1<0,由NT過(guò)點(diǎn)SKIPIF1<0則SKIPIF1<0解得SKIPIF1<0SKIPIF1<0SKIPIF1<0的解析式為SKIPIF1<0,令SKIPIF1<0解得SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0②當(dāng)SKIPIF1<0時(shí),則SKIPIF1<0即SKIPIF1<0解得SKIPIF1<0SKIPIF1<0SKIPIF1<0綜上所述,SKIPIF1<0或SKIPIF1<0(4)如圖,作SKIPIF1<0,交SKIPIF1<0軸于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0于點(diǎn)SKIPIF1<0,則SKIPIF1<0是等腰直角三角形,作SKIPIF1<0于SKIPIF1<0SKIPIF1<0直線SKIPIF1<0的解析式為SKIPIF1<0設(shè)與SKIPIF1<0平行的且與SKIPIF1<0只有一個(gè)公共點(diǎn)的直線SKIPIF1<0解析式為SKIPIF1<0則SKIPIF1<0整理得:SKIPIF1<0則SKIPIF1<0解得SKIPIF1<0SKIPIF1<0直線SKIPIF1<0的解析式為SKIPIF1<0SKIPIF1<0,SKIPIF1<0SKIPIF1<0即拋物線SKIPIF1<0平移的最短距離為SKIPIF1<0,方向?yàn)镾KIPIF1<0方向SKIPIF1<0∴把點(diǎn)P先向右平移EF的長(zhǎng)度,再向下平移FC的長(zhǎng)度即得到平移后的坐標(biāo)SKIPIF1<0平移后的頂點(diǎn)坐標(biāo)為SKIPIF1<0,即SKIPIF1<0本題是二次函數(shù)綜合,考查了相似三角形的性質(zhì),求二次函數(shù)與一次函數(shù)解析式,二次函數(shù)圖象的平移,勾股定理的逆定理,正確的添加輔助線以及正確的計(jì)算是解題的關(guān)鍵.(2022·遼寧沈陽(yáng)·統(tǒng)考中考真題)如圖,平面直角坐標(biāo)系中,O是坐標(biāo)原點(diǎn),拋物線SKIPIF1<0經(jīng)過(guò)點(diǎn)SKIPIF1<0和點(diǎn)SKIPIF1<0與x軸另一個(gè)交點(diǎn)A.拋物線與y軸交于點(diǎn)C,作直線AD.(1)①求拋物線的函數(shù)表達(dá)式②并直接寫出直線AD的函數(shù)表達(dá)式.(2)點(diǎn)E是直線AD下方拋物線上一點(diǎn),連接BE交AD于點(diǎn)F,連接BD,DE,SKIPIF1<0的面積記為SKIPIF1<0,SKIPIF1<0的面積記為SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),求點(diǎn)E的坐標(biāo);(3)點(diǎn)G為拋物線的頂點(diǎn),將拋物線圖象中x軸下方部分沿x軸向上翻折,與拋物線剩下部分組成新的曲線為SKIPIF1<0,點(diǎn)C的對(duì)應(yīng)點(diǎn)SKIPIF1<0,點(diǎn)G的對(duì)應(yīng)點(diǎn)SKIPIF1<0,將曲線SKIPIF1<0,沿y軸向下平移n個(gè)單位長(zhǎng)度(SKIPIF1<0).曲線SKIPIF1<0與直線BC的公共點(diǎn)中,選兩個(gè)公共點(diǎn)作點(diǎn)P和點(diǎn)Q,若四邊形SKIPIF1<0是平行四邊形,直接寫出P的坐標(biāo).(1)①利用待定系數(shù)解答,即可求解;②利用待定系數(shù)解答,即可求解;(2)過(guò)點(diǎn)E作EG⊥x軸交AD于點(diǎn)G,過(guò)點(diǎn)B作BH⊥x軸交AD于點(diǎn)H,設(shè)點(diǎn)SKIPIF1<0,則點(diǎn)SKIPIF1<0,可得SKIPIF1<0,然后根據(jù)△EFG∽△BFH,即可求解;(3)先求出向上翻折部分的圖象解析式為SKIPIF1<0,可得向上翻折部分平移后的函數(shù)解析式為SKIPIF1<0,平移后拋物線剩下部分的解析式為SKIPIF1<0,分別求出直線BC和直線SKIPIF1<0的解析式為,可得BC∥C′G′,再根據(jù)平行四邊形的性質(zhì)可得點(diǎn)SKIPIF1<0,然后分三種情況討論:當(dāng)點(diǎn)P,Q均在向上翻折部分平移后的圖象上時(shí);當(dāng)點(diǎn)P在向上翻折部分平移后的圖象上,點(diǎn)Q在平移后拋物線剩下部分的圖象上時(shí);當(dāng)點(diǎn)P在平移后拋物線剩下部分的圖象上,點(diǎn)Q在向上翻折部分平移后的圖象上時(shí),即可求解.【答案】(1)①SKIPIF1<0;②SKIPIF1<0(2)(2,-4)或(0,-3)(3)(1+SKIPIF1<0,SKIPIF1<0)或SKIPIF1<0【詳解】(1)解:①把點(diǎn)SKIPIF1<0和點(diǎn)SKIPIF1<0代入得:SKIPIF1<0,解得:SKIPIF1<0,∴拋物線解析式為SKIPIF1<0;②令y=0,則SKIPIF1<0,解得:SKIPIF1<0,∴點(diǎn)A(-2,0),設(shè)直線AD的解析式為SKIPIF1<0,∴把點(diǎn)SKIPIF1<0和點(diǎn)A(-2,0)代入得:SKIPIF1<0,解得:SKIPIF1<0,∴直線AD的解析式為SKIPIF1<0;(2)解:如圖,過(guò)點(diǎn)E作EG⊥x軸交AD于點(diǎn)G,過(guò)點(diǎn)B作BH⊥x軸交AD于點(diǎn)H,當(dāng)x=6時(shí),SKIPIF1<0,∴點(diǎn)H(6,-4),即BH=4,設(shè)點(diǎn)SKIPIF1<0,則點(diǎn)SKIPIF1<0,∴SKIPIF1<0,∵SKIPIF1<0的面積記為SKIPIF1<0,SKIPIF1<0的面積記為SKIPIF1<0,且SKIPIF1<0,∴BF=2EF,∵EG⊥x,BH⊥x軸,∴△EFG∽△BFH,∴SKIPIF1<0,∴SKIPIF1<0,解得:SKIPIF1<0或0,∴點(diǎn)E的坐標(biāo)為(2,-4)或(0,-3);(3)解:SKIPIF1<0,∴點(diǎn)G的坐標(biāo)為(2,-4),當(dāng)x=0時(shí),y=-3,即點(diǎn)C(0,-3),∴點(diǎn)SKIPIF1<0,∴向上翻折部分的圖象解析式為SKIPIF1<0,∴向上翻折部分平移后的函數(shù)解析式為SKIPIF1<0,平移后拋物線剩下部分的解析式為SKIPIF1<0,設(shè)直線BC的解析式為SKIPIF1<0,把點(diǎn)B(6,0),C(0,-3)代入得:SKIPIF1<0,解得:SKIPIF1<0,∴直線BC的解析式為SKIPIF1<0,同理直線SKIPIF1<0的解析式為SKIPIF1<0,∴BC∥C′G′,設(shè)點(diǎn)P的坐標(biāo)為SKIPIF1<0,∵點(diǎn)SKIPIF1<0,∴點(diǎn)C′向右平移2個(gè)單位,再向上平移1個(gè)單位得到點(diǎn)G′,∵四邊形SKIPIF1<0是平行四邊形,∴點(diǎn)SKIPIF1<0,當(dāng)點(diǎn)P,Q均在向上翻折部分平移后的圖象上時(shí),SKIPIF1<0,解得:SKIPIF1<0(不合題意,舍去),當(dāng)點(diǎn)P在向上翻折部分平移后的圖象上,點(diǎn)Q在平移后拋物線剩下部分的圖象上時(shí),SKIPIF1<0,解得:SKIPIF1<0或SKIPIF1<0(不合題意,舍去),當(dāng)點(diǎn)P在平移后拋物線剩下部分的圖象上,點(diǎn)Q在向上翻折部分平移后的圖象上時(shí),SKIPIF1<0,解得:SKIPIF1<0(舍去,不合題意)或SKIPIF1<0,綜上所述,點(diǎn)P的坐標(biāo)為綜上所述,點(diǎn)P的坐標(biāo)為(1+SKIPIF1<0,SKIPIF1<0)或(1﹣SKIPIF1<0,SKIPIF1<0).本題主要考查了二次函數(shù)的綜合題,熟練掌握二次函數(shù)的圖象和性質(zhì),平行四邊形的性質(zhì),相似三角形的判定和性質(zhì),并利用數(shù)形結(jié)合思想解答是解題的關(guān)鍵.(2021·廣西梧州·統(tǒng)考中考真題)如圖,在平面直角坐標(biāo)系中,拋物線y=x2+bx+c經(jīng)過(guò)點(diǎn)A(﹣1,0),B(0,3),頂點(diǎn)為C.平移此拋物線,得到一條新的拋物線,且新拋物線上的點(diǎn)D(3,﹣1)為原拋物線上點(diǎn)A的對(duì)應(yīng)點(diǎn),新拋物線頂點(diǎn)為E,它與y軸交于點(diǎn)G,連接CG,EG,CE.(1)求原拋物線對(duì)應(yīng)的函數(shù)表達(dá)式;(2)在原拋物線或新拋物線上找一點(diǎn)F,使以點(diǎn)C,E,F(xiàn),G為頂點(diǎn)的四邊形是平行四邊形,并求出點(diǎn)F的坐標(biāo);(3)若點(diǎn)K是y軸上的一個(gè)動(dòng)點(diǎn),且在點(diǎn)B的上方,過(guò)點(diǎn)K作CE的平行線,分別交兩條拋物線于點(diǎn)M,N,且點(diǎn)M,N分別在y軸的兩側(cè),當(dāng)MN=CE時(shí),請(qǐng)直接寫出點(diǎn)K的坐標(biāo).(1)根據(jù)待定系數(shù)法將點(diǎn)A(﹣1,0),B(0,3)代入拋物線y=x2+bx+c,即可求出原拋物線解析式;(2)根據(jù)新拋物線上的點(diǎn)D(3,﹣1)為原拋物線上點(diǎn)A的對(duì)應(yīng)點(diǎn)可知拋物線平移方式為右移4個(gè)單位下移1個(gè)單位,從而確定新拋物線解析式,進(jìn)而確定點(diǎn)C、D、G坐標(biāo),由以點(diǎn)C,E,F(xiàn),G為頂點(diǎn)的四邊形是平行四邊形即可確定點(diǎn)F坐標(biāo)的可能位置,判斷是否在原拋物線或新拋物線上即可解答;(3)由SKIPIF1<0,MN=CE,可知M點(diǎn)到N點(diǎn)的平移方式和C點(diǎn)到E點(diǎn)平移方式相同,故可設(shè)點(diǎn)M坐標(biāo)為(a,b),可得點(diǎn)N坐標(biāo)為(a+4,b-1),由圖像可知M在新拋物線、N在原拋物線上,據(jù)此列方程求出點(diǎn)M、N坐標(biāo),由直線MN解析式即可求出與y軸交點(diǎn)坐標(biāo)即K點(diǎn)坐標(biāo).【答案】(1)SKIPIF1<0;(2)F(-4,3),(3)SKIPIF1<0.【詳解】解:(1)由拋物線y=x2+bx+c經(jīng)過(guò)點(diǎn)A(﹣1,0),B(0,3),得:SKIPIF1<0,解得:SKIPIF1<0,∴原拋物線對(duì)應(yīng)的函數(shù)表達(dá)式為:SKIPIF1<0;(2)由(1)得:原拋物線為:SKIPIF1<0,故頂點(diǎn)C坐標(biāo)為SKIPIF1<0∵新拋物線上的點(diǎn)D(3,﹣1)為原拋物線上點(diǎn)A的對(duì)應(yīng)點(diǎn),∴原拋物線向右移4個(gè)單位,向下移1個(gè)單位得到新拋物線,∴新拋物線對(duì)應(yīng)的函數(shù)表達(dá)式為:SKIPIF1<0,即:SKIPIF1<0故新拋物線頂E點(diǎn)坐標(biāo)為SKIPIF1<0,與y軸交點(diǎn)G坐標(biāo)為SKIPIF1<0,以點(diǎn)C,E,F(xiàn),G為頂點(diǎn)的四邊形是平行四邊形,點(diǎn)F不可能在CE下方,故如圖所示:當(dāng)平行四邊形為SKIPIF1<0時(shí),點(diǎn)F坐標(biāo)為SKIPIF1<0,即SKIPIF1<0,根據(jù)平移性質(zhì)可知:SKIPIF1<0一定在原拋物線;當(dāng)平行四邊形為SKIPIF1<0時(shí),點(diǎn)F坐標(biāo)為SKIPIF1<0,即SKIPIF1<0,此時(shí)SKIPIF1<0;故不在新拋物線上,綜上所述:以點(diǎn)C,E,F(xiàn),G為頂點(diǎn)的四邊形是SKIPIF1<0時(shí),F(xiàn)的坐標(biāo)為SKIPIF1<0;(3)∵SKIPIF1<0,MN=CE,∴M點(diǎn)到N點(diǎn)的平移方式和C點(diǎn)到E點(diǎn)平移方式相同,設(shè)M在左側(cè),坐標(biāo)為(a,b),則點(diǎn)N坐標(biāo)為(a+4,b-1),由圖可知,點(diǎn)M在新拋物線,點(diǎn)N在原拋物線,SKIPIF1<0,解得:SKIPIF1<0,即M點(diǎn)坐標(biāo)為SKIPIF1<0,∴點(diǎn)N坐標(biāo)為SKIPIF1<0,設(shè)直線MN解析式為SKIPIF1<0,∴SKIPIF1<0,解得:SKIPIF1<0,即:SKIPIF1<0,故直線MN與y軸交點(diǎn)K坐標(biāo)為SKIPIF1<0.本題主要考查了函數(shù)圖像的平移、函數(shù)圖像與幾何圖形結(jié)合的綜合能力的培養(yǎng),要會(huì)利用數(shù)形結(jié)合的思想把代數(shù)和幾何圖形結(jié)合起來(lái),掌握?qǐng)D像平移的性質(zhì)確定函數(shù)解析式和點(diǎn)的坐標(biāo)是解題關(guān)鍵.1.(2022·重慶開州·校聯(lián)考模擬)如圖1,拋物線SKIPIF1<0與x軸交于A、B兩點(diǎn)(點(diǎn)A在點(diǎn)B的左側(cè)),與y軸交于點(diǎn)C,過(guò)點(diǎn)B作直線SKIPIF1<0直線SKIPIF1<0,交拋物線y于另一點(diǎn)D,點(diǎn)P為直線SKIPIF1<0上方拋物線上一動(dòng)點(diǎn).(1)求線段SKIPIF1<0的長(zhǎng).(2)過(guò)點(diǎn)P作SKIPIF1<0軸交SKIPIF1<0于點(diǎn)Q,交直線SKIPIF1<0于點(diǎn)F,過(guò)點(diǎn)P作SKIPIF1<0于點(diǎn)E,求SKIPIF1<0的最大值及此時(shí)點(diǎn)P的坐標(biāo).(3)如圖2,將拋物線SKIPIF1<0向右平移3個(gè)單位得到新拋物線SKIPIF1<0,點(diǎn)M為新拋物線上一點(diǎn),點(diǎn)N為原拋物線對(duì)稱軸一點(diǎn),直接寫出所有使得A、B、M、N為頂點(diǎn)的四邊形是平行四邊形時(shí)點(diǎn)N的坐標(biāo),并寫出其中一個(gè)點(diǎn)N的坐標(biāo)的求解過(guò)程.2.(2021·山東濱州·模擬)如圖,在平面直角坐標(biāo)系中,拋物線SKIPIF1<0分別交SKIPIF1<0軸,SKIPIF1<0軸于點(diǎn)A,SKIPIF1<0和點(diǎn)SKIPIF1<0,拋物線SKIPIF1<0與拋物線SKIPIF1<0關(guān)于直線SKIPIF1<0對(duì)稱,兩條拋物線的交點(diǎn)為SKIPIF1<0,SKIPIF1<0(點(diǎn)SKIPIF1<0在點(diǎn)SKIPIF1<0的左側(cè)).(1)求拋物線SKIPIF1<0的表達(dá)式;(2)將拋物線SKIPIF1<0沿SKIPIF1<0軸正方向平移,使點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合,求平移的距離;(3)在(2)的條件下:規(guī)定拋物線SKIPIF1<0和拋物線SKIPIF1<0在直線SKIPIF1<0下方的圖象所組成的圖象為SKIPIF1<0,點(diǎn)SKIPIF1<0,SKIPIF1<0和SKIPIF1<0,SKIPIF1<0在函數(shù)SKIPIF1<0上(點(diǎn)SKIPIF1<0在點(diǎn)SKIPIF1<0的右側(cè)),在(2)的條件下,若SKIPIF1<0,且SKIPIF1<0,求點(diǎn)SKIPIF1<0坐標(biāo).3.(2022·陜西渭南·統(tǒng)考三模)在平面直角坐標(biāo)系中,已知拋物線SKIPIF1<0(b、c為常數(shù))與x軸交于SKIPIF1<0、SKIPIF1<0兩點(diǎn).(1)求拋物線SKIPIF1<0的函數(shù)表達(dá)式;(2)將該拋物線SKIPIF1<0向右平移4個(gè)單位長(zhǎng)度得到新的拋物線SKIPIF1<0,與原拋物線SKIPIF1<0交于點(diǎn)C,點(diǎn)D是點(diǎn)C關(guān)于x軸的對(duì)稱點(diǎn),點(diǎn)N在平面直角坐標(biāo)系中,請(qǐng)問(wèn)在拋物線SKIPIF1<0上是否存在點(diǎn)M,使得以點(diǎn)C、D、M、N為頂點(diǎn)的四邊形是以CD為邊的矩形?若存在,求出點(diǎn)M的坐標(biāo);若不存在,請(qǐng)說(shuō)明理由.4.(2022·廣東深圳·深圳市寶安第一外國(guó)語(yǔ)學(xué)校校考三模)已知拋物線SKIPIF1<0:SKIPIF1<0與SKIPIF1<0軸交于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0的直線與SKIPIF1<0交于點(diǎn)SKIPIF1<0.(1)求直線SKIPIF1<0的函數(shù)表達(dá)式;(2)如圖SKIPIF1<0,若點(diǎn)SKIPIF1<0為直線SKIPIF1<0下方的SKIPIF1<0上一點(diǎn),求點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離的最大值;(3)如圖SKIPIF1<0,將直線SKIPIF1<0繞點(diǎn)SKIPIF1<0順時(shí)針旋轉(zhuǎn)SKIPIF1<0后恰好經(jīng)過(guò)SKIPIF1<0的頂點(diǎn)SKIPIF1<0,沿射線SKIPIF1<0的方向平移拋物線SKIPIF1<0得到拋物線SKIPIF1<0,SKIPIF1<0的頂點(diǎn)為SKIPIF1<0,兩拋物線相交于點(diǎn)SKIPIF1<0設(shè)交點(diǎn)SKIPIF1<0的橫坐標(biāo)為SKIPIF1<0若SKIPIF1<0,求SKIPIF1<0的值.5.(2022·重慶·西南大學(xué)附中??既#┤鐖D,在平面直角坐標(biāo)系中,拋物線SKIPIF1<0與x軸交于SKIPIF1<0,B兩點(diǎn),其對(duì)稱軸SKIPIF1<0與x軸交于點(diǎn)D.圖1
圖2(1)求該拋物線的函數(shù)表達(dá)式;(2)如圖1,點(diǎn)P為第四象限內(nèi)的拋物線上一動(dòng)點(diǎn),連接PB,PC,CD,求四邊形PBDC面積的最大值和此時(shí)點(diǎn)P的坐標(biāo);(3)將該拋物線向左平移3個(gè)單位長(zhǎng)度得到拋物線y',平移后的拋物線與原拋物線的對(duì)稱軸相交于點(diǎn)E,點(diǎn)F為拋物線y'對(duì)稱軸上的一點(diǎn),M是原拋物線上的動(dòng)點(diǎn),直接寫出所有使得以點(diǎn)A,E,F(xiàn),M為頂點(diǎn)的四邊形是平行四邊形的點(diǎn)M的坐標(biāo),并把求其中一個(gè)點(diǎn)M的坐標(biāo)的過(guò)程寫出來(lái).6.(2022·內(nèi)蒙古呼和浩特·統(tǒng)考三模)拋物線SKIPIF1<0與SKIPIF1<0軸交于點(diǎn)SKIPIF1<0,SKIPIF1<0,直線SKIPIF1<0與拋物線交于SKIPIF1<0,SKIPIF1<0兩點(diǎn).(1)求拋物線的解析式.(2)在此拋物線的對(duì)稱軸上是否存在一點(diǎn)SKIPIF1<0,使得SKIPIF1<0的周長(zhǎng)最小?若存在,請(qǐng)求出點(diǎn)SKIPIF1<0的坐標(biāo);若不存在,請(qǐng)說(shuō)明理由.(3)若點(diǎn)SKIPIF1<0為直線SKIPIF1<0上方的拋物線上的一個(gè)動(dòng)點(diǎn)(不與點(diǎn)SKIPIF1<0,SKIPIF1<0重合),將直線SKIPIF1<0上方的拋物線部分關(guān)于直線SKIPIF1<0對(duì)稱形成愛心圖案,動(dòng)點(diǎn)SKIPIF1<0關(guān)于直線SKIPIF1<0對(duì)稱的點(diǎn)為SKIPIF1<0,求SKIPIF1<0的取值范圍.7.(2022·陜西寶雞·統(tǒng)考二模)如圖,在平面直角坐標(biāo)系中,拋物線SKIPIF1<0的圖象經(jīng)過(guò)SKIPIF1<0,SKIPIF1<0兩點(diǎn),將拋物線SKIPIF1<0向右平移2個(gè)單位得到拋物線SKIPIF1<0,平移后點(diǎn)A的對(duì)應(yīng)點(diǎn)為點(diǎn)B.(1)求拋物線SKIPIF1<0與SKIPIF1<0的函數(shù)表達(dá)式;(2)若點(diǎn)M是拋物線SKIPIF1<0上一動(dòng)點(diǎn),點(diǎn)N是拋物線SKIPIF1<0上一動(dòng)點(diǎn),請(qǐng)問(wèn)是否存在這樣的點(diǎn)M、N,使得以A、B、M、N為頂點(diǎn)且以AB為邊的四邊形是面積為8的平行四邊形?若存在,求出點(diǎn)M、N的坐標(biāo);若不存在,請(qǐng)說(shuō)明理由.8.(2022·四川成都·統(tǒng)考二模)如圖,拋物線SKIPIF1<0:SKIPIF1<0與SKIPIF1<0軸相交于SKIPIF1<0,SKIPIF1<0兩點(diǎn)(點(diǎn)SKIPIF1<0在點(diǎn)SKIPIF1<0的左側(cè)),已知點(diǎn)SKIPIF1<0的橫坐標(biāo)是2,拋物線SKIPIF1<0的頂點(diǎn)為SKIPIF1<0.(1)求SKIPIF1<0的值及頂點(diǎn)SKIPIF1<0的坐標(biāo);(2)點(diǎn)SKIPIF1<0是SKIPIF1<0軸正半軸上一點(diǎn),將拋物線SKIPIF1<0繞點(diǎn)SKIPIF1<0旋轉(zhuǎn)SKIPIF1<0后得到的拋物線SKIPIF1<0,記拋物線SKIPIF1<0的頂點(diǎn)為SKIPIF1<0,拋物線SKIPIF1<0與SKIPIF1<0軸的交點(diǎn)為SKIPIF1<0,SKIPIF1<0(點(diǎn)SKIPIF1<0在點(diǎn)SKIPIF1<0的右側(cè)).當(dāng)點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合時(shí)(如圖1),求拋物線SKIPIF1<0的表達(dá)式;(3)如圖2,在(2)的條件下,從SKIPIF1<0,SKIPIF1<0,SKIPIF1<0中任取一點(diǎn),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0中任取兩點(diǎn),若以取出的三點(diǎn)為頂點(diǎn)能構(gòu)成直角三角形,我們就稱拋物線SKIPIF1<0為拋物線SKIPIF1<0的“勾股伴隨同類函數(shù)”.當(dāng)拋物線SKIPIF1<0是拋物線SKIPIF1<0
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