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在平面直角坐标系中,若不等式组http://picflow.koolearn.com/upload/papers/g02/20111124/201111241040124681264.gif(a为常数)所表示的平面区域内的面积等于2,则a的值为

发布时间:2021-07-19

A.-5

B.1

C.2

D.3

试卷相关题目

  • 1如果直线y=kx+1与圆x2+y2+kx+my-4=0交于M、N两点,且M、N关于直线x+y=0对称,则不等式组http://picflow.koolearn.com/upload/papers/g02/20120821/201208211410498251052.png表示的平面区域的面积是

    A.http://picflow.koolearn.com/upload/papers/g02/20120821/20120821141050203277.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120821/20120821141051414280.png

    C.1

    D.2

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  • 2在平面直角坐标系中,不等式组http://picflow.koolearn.com/upload/papers/g02/20120818/201208181703513123476.png,表示的平面区域的面积是http://picflow.koolearn.com/upload/papers/g02/20120818/2012081817035169416354.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120818/20120818170351739942.png

    B.4

    C.http://picflow.koolearn.com/upload/papers/g02/20120818/20120818170351783930.png

    D.2

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  • 3设变量x,y满足约束条件:http://picflow.koolearn.com/upload/papers/g02/20120831/201208311425098963430.png.则目标函数z=2x+3y的最小值为

    A.6

    B.7

    C.8

    D.23

    开始考试点击查看答案
  • 4某运输公司有12名驾驶员和19名工人,有8辆载重量为10吨的甲型卡车和7辆载重量为6吨的乙型卡车,某天需送往A地至少72吨的货物,派用的每辆车需载满且只能送一次,派用的每辆甲型卡车需配2名工人,运送一次可得利润450元;派用的每辆乙型卡需配1名工人;没送一次可得利润350元,该公司合理计划当天派用甲乙卡车的车辆数,可得最大利润z=

    A.4650元

    B.4700元

    C.4900元

    D.5000元

    开始考试点击查看答案
  • 5x、y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120916/201209161511494793755.png,若目标函数z=ax+by(a>0,b>0)的最大值为7,则http://picflow.koolearn.com/upload/papers/g02/20120916/201209161511495911226.png的最小值为

    A.14

    B.7

    C.18

    D.13

    开始考试点击查看答案
  • 6若A为不等式组http://picflow.koolearn.com/upload/papers/g02/20120817/201208171748391922620.png表示的平面区域,则a从﹣2连续变化到1时,动直线x+y=a扫过A中的那部分区域的面积为

    A.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817174839236973.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817174839280958.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817174839324594.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817174839369593.png

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  • 7设x、y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120604/201206041642278213184.png,若目标函数z=ax+by(a>0,b>0)的最大值是12,则http://picflow.koolearn.com/upload/papers/g02/20120604/201206041642278631398.png的最小值为  

    A.http://picflow.koolearn.com/upload/papers/g02/20120604/20120604164227904870.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120604/20120604164227947516.png

    C.1

    D.2

    开始考试点击查看答案
  • 8设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120704/201207040942227149889.png则目标函数z=3x-y 的取值范围是

    A.http://picflow.koolearn.com/upload/papers/g02/20120704/201207040942227412999.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120704/201207040942227663255.png

    C.[-1,6]

    D.http://picflow.koolearn.com/upload/papers/g02/20120704/201207040942227902870.png

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  • 9设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120816/201208161542296964607.png,则目标函数z=2x+y的最大值为

    A.8

    B.13

    C.14

    D.10

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  • 10已知变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120915/20120915101831608777.png,则z=3x+y的最大值为

    A.12

    B.11

    C.3

    D.-1

    开始考试点击查看答案
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