一、选择题(本大题共12小题,每小题5分,共60分)
1.已知函数\(f(x)=\frac{1}{x^2+1}\),若\(f(a)=\frac{1}{2}\),则\(a\)的值为()
A.1
B.\(\pm1\)
C.\(\pm\sqrt{3}\)
D.\(\pm\sqrt{2}\)
2.在直角坐标系中,若点\(A(2,3)\)关于直线\(y=x\)的对称点为\(B\),则点\(B\)的坐标为()
A.(3,2)
B.(3,2)
C.(2,3)
D.(2,3)
3.已知等差数列\(\{a_n\}\)的前\(n\)项和为\(S_n=3n^2+2n\),则该数列的通项公式为()
A.\(a_n=6n1\)
B.\(a_n=6n+1\)
C.\(a_n=3n1\)
D.\(a_n=3n+1\)
4.在直角三角形\(ABC\)中,若\(\angleB=90^\circ\),且\(BC=4\),\(AC=3\),则\(\sinA\)的值为()
A.\(\frac{3}{5}\)
B.\(\frac{4}{5}\)
C.\(\frac{3}{4}\)
D.\(\frac{4}{3}\)
5.已知复数\(z=1+2i\),则\(|z|\)的值为()
A.\(\sqrt{5}\)
B.\(\sqrt{3}\)
C.\(\sqrt{2}\)
D.1
6.在等比数列\(\{b_n\}\)中,若\(b_1=2\),\(b_3=8\),则该数列的公比为()
A.2
B.3
C.4
D.5
7.已知\(\log_2x=3\),则\(x\)的值为()
A.8
B.4
C.2
D.1
8.若函数\(f(x)=x^24x+3\)的图像关于某条直线对称,则该直线的方程为()
A.\(x=2\)
B.\(x=1\)
C.\(x=3\)
D.\(x=4\)
9.已知圆\(C\)的方程为\((x2)^2+(y3)^2=4\),则圆\(C\)的半径为()
A.2
B.3
C.4
D.5
10.在空间直角坐标系中,若点\(P(1,2,3)\),\(Q(4,5,6)\),则向量\(\overrightarrow{PQ}\)的模长为()
A.\(\sqrt{6}\)
B.\(\sqrt{10}\)
C.\(\sqrt{14}\)
D.\(\sqrt{18}\)
11.已知\(\tan\theta=\frac{1}{\sqrt{3}}\),则\(\sin\theta\)的值为()
A.\(\frac{\sqrt{3}}{2}\)
B.\(\frac{1}{2}\)
C.\(\frac{\sqrt{2}}{2}\)
D.\(\frac{\sqrt{6}}{3}\)
12.在概率论中,若事件\(A\)和\(B\)相互独立,且\(P(A)=0.4\),\(P(B)=0.5\),则\(P(A\capB)\)的值为()
A.0.2
B.0.3
C.0.4
D.0.5
二、填空题(本大题共4小题,每小题5分,共20分)
13.若\(a=2\),\(b=3\),则\(a^2+b^2\)的值为__________。
14.已知函数\(f(x)=x^33x\),则\(f(1)\)的值为__________。
15.在等差数列\(\{a_n\}\)中,若\(a_1=1\),\(a_5=9\),则该数列的公差为__________。
16.已知圆\(C