满分5 >
高中数学试题 >
若x,y满足约束条件,则目标函数z=2x+y的最大值是( ) A.-3 B. C...
若x,y满足约束条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214003_ST/0.png)
,则目标函数z=2x+y的最大值是( )
A.-3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214003_ST/1.png)
C.2
D.3
考点分析:
相关试题推荐
已知平面向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214002_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214002_ST/1.png)
的值是( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214002_ST/2.png)
C.4
D.
查看答案
下列命题中的真命题是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700921485/SYS201311031000387009214001_ST/0.png)
B.∀x∈(0,+∞),e
x>x+1
C.∃x∈(-∞,0),2
x<3
xD.∀x∈(0,+π),sinx>cos
查看答案
已知a,b∈R,i是虚数单位,且(a-2)i-b=1+i,则(1+i)
a+b的值为( )
A.4
B.-4
C.4+4i
D.2i
查看答案
已知定义在实数集R上的奇函数f(x)有最小正周期2,且当x∈(0,1)时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700431479/SYS201311031000387004314021_ST/0.png)
.
(Ⅰ)求函数f(x)在(-1,1)上的解析式;
(Ⅱ)判断f(x)在(0,1)上的单调性;
(Ⅲ)当λ取何值时,方程f(x)=λ在(-1,1)上有实数解?
查看答案
已知幂函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700431479/SYS201311031000387004314020_ST/0.png)
(m∈Z) 为偶函数,且在区间(0,+∞)上是单调增函数.
(1)求函数f(x)的解析式;
(2)设函数g(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100038700431479/SYS201311031000387004314020_ST/1.png)
,若g(x)=0的两个实根分别在区间(-3,-2),(0,1)内,求实数b的取值范围.
查看答案