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设函数f(x)=http://picflow.koolearn.com/upload/papers/g02/20120401/201204011541269351475.gif,则不等式f(x)≥2x2的解集是

发布时间:2021-07-20

A.http://picflow.koolearn.com/upload/papers/g02/20120401/201204011541269831025.gif

B.http://picflow.koolearn.com/upload/papers/g02/20120401/201204011541270121029.gif

C.http://picflow.koolearn.com/upload/papers/g02/20120401/201204011541270401081.gif

D.[ -1,1]

试卷相关题目

  • 1不等式2x2﹣x﹣1>0的解集是  

    A.http://picflow.koolearn.com/upload/papers/g02/20120828/20120828095113447775.png

    B.(1,+∞)

    C.(﹣∞,1)∪(2,+∞)

    D.http://picflow.koolearn.com/upload/papers/g02/20120828/20120828095113470818.png∪(1,+∞)

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  • 2若不等式2kx2+kx-http://picflow.koolearn.com/upload/papers/g02/20120406/20120406093422801941.gif<0对一切实数x都成立,则k的取值范围为

    A.(-3,0]

    B.(-3,0)

    C.[-3,0]

    D.[-3,0)

    开始考试点击查看答案
  • 3若不等式x2+ax+1≥0对一切http://picflow.koolearn.com/upload/papers/g02/20120820/201208202135145591668.png成立,则a的最小值为

    A.1

    B.﹣2

    C.http://picflow.koolearn.com/upload/papers/g02/20120820/20120820213514610803.png

    D.﹣3

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  • 4函数http://picflow.koolearn.com/upload/papers/g02/20111111/201111111053265151239.gif,则不等式f(x)≥x2的解集是

    A.[-1,1]

    B.[-2,2]

    C.[-2,1]

    D.[-1,2]

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  • 5二次不等式ax2+bx+c<0的解集是全体实数的条件是

    A.http://picflow.koolearn.com/upload/papers/g02/20120326/201203261153215571191.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20120326/201203261153215681186.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20120326/201203261153215761197.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20120326/201203261153215871204.gif

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  • 6若关于x的不等式ax2+bx+21<0的解集为http://picflow.koolearn.com/upload/papers/g02/20120914/201209142138078061971.png,则a等于

    A.1

    B.2

    C.3

    D.4

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  • 7二次不等式ax2+bx+c>0的解集是全体实数的条件是(  )

    A.a>0△>0

    B.a>0△<0

    C.a<0△>0

    D.a<0△<0

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  • 8下列续集中正确的个数是 ①命题“存在x∈R,x2﹣x>0”的否定是“任意x∈R,x2﹣x>0”; ②命题“若am2<bm2,则a<b”的逆命题是真命题; ③若¬p是q的必要条件,则p是¬q的充分条件; ④任意x∈R,不等式x2+2x>4x﹣3均成立.

    A.1个

    B.2个

    C.3个

    D.4个

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  • 9关于x的不等式x2+px-2<0的解集是(q,1),则p+q的值为 

    A.-2

    B.-1

    C.1

    D.2

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  • 10在R上定义运算⊙:a⊙b=ab+2a+b,则满足x⊙(x-2)<0的实数x的取值范围为

    A.(0,2)

    B.(-2,1)

    C.http://picflow.koolearn.com/upload/papers/g02/20111124/201111241409579531054.gif

    D.(-1,2)

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