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不等式2x+y-3≤0表示的平面区域(用阴影表示)是(  )

发布时间:2021-07-19

A.http://picflow.koolearn.com/upload/papers/20140611/201406111021585232072.png

B.http://picflow.koolearn.com/upload/papers/20140611/201406111021586012674.png

C.http://picflow.koolearn.com/upload/papers/20140611/201406111021594272475.png

D.http://picflow.koolearn.com/upload/papers/20140611/201406111021595212248.png

试卷相关题目

  • 1已条变量x,y满足x≥1y≤2x-y≤0,则x+y的最小值是(  )

    A.4

    B.3

    C.2

    D.1

    开始考试点击查看答案
  • 2图中阴影部分可用二元一次不等式组表示(  )

    A.y≥-12x-y+2≥0

    B.y≥-12x-y+2≤0

    C.x≤0y>-22x+y+4≥0

    D.x≤0y≥-22x-y+4≥0 http://picflow.koolearn.com/upload/papers/20140611/201406111056563996457.png

    开始考试点击查看答案
  • 3图中阴影部分表示的平面区域满足的不等式是(  )

    A.x+y-1<0

    B.x+y-1>0

    C.x-y-1<0

    D.x-y-1>0 http://picflow.koolearn.com/upload/papers/20140611/201406111121144864153.png

    开始考试点击查看答案
  • 4若实数x,y满足不等式组x-2≤0y-1≤0x+2y-2≥0,则x-y的最小值为(  )

    A.-2

    B.-1

    C.1

    D.2

    开始考试点击查看答案
  • 5下列各二元一次不等式组能表示如图所示阴影部分的是(  )

    A.x≤22x-y+4≤0

    B.0≤x≤22x-y+4≤0

    C.x≤0y≤22x-y+4≥0

    D.x≤00≤y≤22x-y+4≥0 http://picflow.koolearn.com/upload/papers/20140611/201406111124231842973.png

    开始考试点击查看答案
  • 6已知点(x,y)是不等式组x≥1x+y≤4ax+by+c≥0表示的平面区域内的一个动点,且目标函数z=2x+y的最大值为7,最小值为1,则的值为(  )

    A.2

    B.12

    C.-2

    D.-1

    开始考试点击查看答案
  • 7已知:函数f(x)的定义域为[-2,+∞),且f(4)=f(-2)=1,f′(x)为f(x)的导函数,函数y=f′(x)的图象如图所示,则a≥0b≥0f(2a+b)≤1,所围成的平面区域的面积是(  )

    A.2

    B.4

    C.5

    D.8 http://picflow.koolearn.com/upload/papers/20140611/2014061111280356610386.png

    开始考试点击查看答案
  • 8若变量x、y满足约束条件x+y<6x-3y≤-2x≥1,则z=2x+3y的最小值为(  )

    A.17

    B.14

    C.5

    D.3

    开始考试点击查看答案
  • 9由不等式组x≥0y≥0x+y-1≤0表示的平面区域(图中阴影部分)为(  )

    A.http://picflow.koolearn.com/upload/papers/20140611/20140611113351400957.png

    B.http://picflow.koolearn.com/upload/papers/20140611/20140611113351447946.png

    C.http://picflow.koolearn.com/upload/papers/20140611/20140611113351525924.png

    D.http://picflow.koolearn.com/upload/papers/20140611/20140611113351915993.png

    开始考试点击查看答案
  • 10如果函数y=ax2+bx+a的图象与x轴有两个交点,则点(a,b)在aOb平面上的区域(不包含边界)为(  )

    A.http://picflow.koolearn.com/upload/papers/20140611/201406111150054656724.png

    B.http://picflow.koolearn.com/upload/papers/20140611/201406111150061366632.png

    C.http://picflow.koolearn.com/upload/papers/20140611/201406111150063087577.png

    D.http://picflow.koolearn.com/upload/papers/20140611/201406111150064488166.png

    开始考试点击查看答案
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