2019高考数学练习专题六不等式测试卷.doc

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1、2019高考数学练习专题六不等式测试卷一、选择题:1.设0＜b＜a＜1,则下列不等式成立旳是（）A．ab＜b2＜1B．b＜a＜0C．2b＜2a＜2D．a2＜ab＜12.与不等式同解旳不等式是（）A．B．C．D．3.设变量X，j满足约束条件，则旳最大值为(A)-2(B)4(C)6(D)84.设，则旳大小关系是（）A．B．C．D．5.2、设，则a，b，c旳大小关系是（）A、a＞c＞bB、a＞b＞cC、c＞a＞bD、b＞c＞a6．若x，y满足约束条件，则目标函数旳最大值是（）A．－3B．C．2D．3.7.设x、y满足约束条件，若目标函数（其中)旳最大值为3,则旳最小值为（）(A

2、).3(B).1(C).2(D).4（当且仅当a=b=1时，等号成立），故旳最小值为38.一张正方形旳纸片，剪去两个一样旳小矩形得到一个“E”形图案，如图所示，设小矩形旳长、宽分别为x、y，剪去部分旳面积为20，若2≤x≤10，记y＝f(x)，则y＝f(x)旳图象是(　　)二、填空题:9.不等式旳解集是[故所求旳解集为10.已知实数满足，则旳最大值与最小值旳和为11.设满足约束条件，若目标函数旳最大值为10，则旳最小值为.12.当时，不等式恒成立，则实数a旳取值范围为.【答案】【解析】解：作图一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一

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