在二项式(x
2-
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)
5的展开式中,含x
4的项的系数是
.
考点分析:
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某曲线极坐标方程为p=8cosθ,则它的直角坐标方程为
.
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下列结论:①命题“∀x∈R,x
2-x>0”的否定是“∃x∈R,x
2-x≤0”;
②当x∈(1,+∞)时,函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934007_ST/0.png)
的图象都在直线y=x的上方;
③定义在R上的奇函数f(x),满足f(x+2)=-f(x),则f(6)的值为0.
④若函数f(x)=mx
2-2x在区间(2+∞)内是增函数,则实数m的取值范围为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934007_ST/1.png)
.
其中,正确结论的个数是( )
A.1
B.2
C.3
D.4
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定义运算:
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,将函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934006_ST/1.png)
的图象向左平移t(t>0)个单位,所得图象对应的函数为偶函数,则t的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934006_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934006_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934006_ST/4.png)
D.
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连续投掷两次骰子得到的点数分别为m、n,作向量a=(m,n).则向量a与向量b=(1,-1)的夹角成为直角三角形内角的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934005_ST/2.png)
D.
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圆x
2+(y+1)
2=3绕直线kx-y-1=0旋转一周所得的几何体的体积为( )
A.36π
B.12π
C.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968893459/SYS201310241826329688934004_ST/0.png)
π
D.4π
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