新高考數(shù)學(xué)一輪復(fù)習(xí)講與練第03講 二次函數(shù)與一元二次方程、不等式（練）（原卷版）

第03講二次函數(shù)與一元二次不方程、不等式1．不等式SKIPIF1<0的解集為（

）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<02．定義SKIPIF1<0，若關(guān)于SKIPIF1<0的不等式SKIPIF1<0在SKIPIF1<0上恒成立，則實(shí)數(shù)SKIPIF1<0的取值范圍為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<03．“不等式SKIPIF1<0在R上恒成立”的充要條件是（

）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<04．不等式組SKIPIF1<0的解集為_(kāi)________.5．若不等式SKIPIF1<0的解集為空集，則實(shí)數(shù)SKIPIF1<0的取值范圍是_____．6．關(guān)于x的不等式SKIPIF1<0的解集為SKIPIF1<0，則b的值為_(kāi)__．7．若SKIPIF1<0且SKIPIF1<0，則SKIPIF1<0的值是_________.8．若方程SKIPIF1<0有兩個(gè)不相等的實(shí)根，則SKIPIF1<0可取的最大整數(shù)值是______.1．若“SKIPIF1<0”是“SKIPIF1<0”的必要不充分條件，則實(shí)數(shù)SKIPIF1<0的取值范圍是_________.2．已知a＞b，關(guān)于x的不等式SKIPIF1<0對(duì)于一切實(shí)數(shù)x恒成立，又存在實(shí)數(shù)SKIPIF1<0，使得SKIPIF1<0成立，則SKIPIF1<0最小值為_(kāi)________．3．不等式SKIPIF1<0的解集為_(kāi)_____________．4．已知命題“SKIPIF1<0，SKIPIF1<0”為真命題，則實(shí)數(shù)a的取值范圍是______．5．解關(guān)于SKIPIF1<0的不等式SKIPIF1<0．6．若關(guān)于SKIPIF1<0的不等式SKIPIF1<0的解集中恰有SKIPIF1<0個(gè)正整數(shù)，求實(shí)數(shù)SKIPIF1<0的取值范圍.SKIPIF1<07．請(qǐng)回答下列問(wèn)題：若關(guān)于SKIPIF1<0的不等式SKIPIF1<0的解集為SKIPIF1<0或SKIPIF1<0，求SKIPIF1<0，SKIPIF1<0的值.8．已知函數(shù)SKIPIF1<0；(1)若關(guān)于SKIPIF1<0的不等式SKIPIF1<0的解集為SKIPIF1<0，求實(shí)數(shù)SKIPIF1<0的值；(2)存在SKIPIF1<0，使得SKIPIF1<0成立，求實(shí)數(shù)SKIPIF1<0的取值范圍．1．（2020·山東·高考真題）已知二次函數(shù)SKIPIF1<0的圖像如圖所示，則不等式SKIPIF1<0的解集是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<02．（2019·全國(guó)·高考真題（理））已知集合SKIPIF1<0，則SKIPIF1<0A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<03．（2019·全國(guó)·高考真題（理））已知集合SKIPIF1<0，則SKIPIF1<0=A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<04．（2013·陜西·高考真題（理））在如圖所示的銳角三角形空地中,欲建一個(gè)面積不小于300m2的內(nèi)接矩形花園(陰影部分),則其邊長(zhǎng)x(單位m)的取值范圍是A．[15,20] B．[12,25] C．[10,30] D．[20,30]5．（2009·山東·高考真題（文））在R上定義運(yùn)算⊙：⊙，則滿足⊙<0的實(shí)數(shù)的取值范圍為A．(0，2) B．(-2，1) C． D．(-1，2)6．（2010·浙江·高考真題（文））某商家一月份至五月份累計(jì)銷售額達(dá)3860萬(wàn)元，預(yù)測(cè)六月份銷售額為500萬(wàn)元，七月份銷售額比六月份遞增x%，八月份銷售額比七月份遞增x%，九、十月份銷售總額與七、八月份銷售總額相等，若一月至十月份銷售總額至少至少達(dá)7000萬(wàn)元，則，x的最小值_______7．（2012·江蘇·高考真題）已知函數(shù)的值域?yàn)镾KIPIF1<0，若關(guān)于x的不等式SKIPIF1<0的解集為SKIPIF1<0，則實(shí)數(shù)c的值