1.已知全集U={1,2,3,4,5},集合M={1,2,3},N={3,4,5},则M∩(UN)=( )A.{1,2} B.{4,5} C.{3} D.{1,2,3,4,5}2.复数z=i2(1+i)的虚部为( )A.1 B.i C.-1 D.- i 3.正项数列{an}成等比,a1+a2=3,a3+a4=12,则a4+a5的值是(
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/18 23:31:55
![1.已知全集U={1,2,3,4,5},集合M={1,2,3},N={3,4,5},则M∩(UN)=( )A.{1,2} B.{4,5} C.{3} D.{1,2,3,4,5}2.复数z=i2(1+i)的虚部为( )A.1 B.i C.-1 D.- i 3.正项数列{an}成等比,a1+a2=3,a3+a4=12,则a4+a5的值是(](/uploads/image/z/14800411-19-1.jpg?t=1%EF%BC%8E%E5%B7%B2%E7%9F%A5%E5%85%A8%E9%9B%86U%3D%7B1%2C2%2C3%2C4%2C5%7D%2C%E9%9B%86%E5%90%88M%EF%BC%9D%7B1%2C2%2C3%7D%2CN%EF%BC%9D%7B3%2C4%2C5%7D%2C%E5%88%99M%E2%88%A9%28UN%29%EF%BC%9D%EF%BC%88+%EF%BC%89A.%7B1%2C2%7D+B.%EF%BD%9B4%2C5%EF%BD%9D+C.%EF%BD%9B3%EF%BD%9D+D.%EF%BD%9B1%2C2%2C3%2C4%2C5%EF%BD%9D2.%E5%A4%8D%E6%95%B0z%3Di2%281%2Bi%29%E7%9A%84%E8%99%9A%E9%83%A8%E4%B8%BA%EF%BC%88+%EF%BC%89A.1+B.i+C.-1+D.-+i+3%EF%BC%8E%E6%AD%A3%E9%A1%B9%E6%95%B0%E5%88%97%7Ban%7D%E6%88%90%E7%AD%89%E6%AF%94%2Ca1%2Ba2%3D3%2Ca3%2Ba4%3D12%2C%E5%88%99a4%2Ba5%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88)
1.已知全集U={1,2,3,4,5},集合M={1,2,3},N={3,4,5},则M∩(UN)=( )A.{1,2} B.{4,5} C.{3} D.{1,2,3,4,5}2.复数z=i2(1+i)的虚部为( )A.1 B.i C.-1 D.- i 3.正项数列{an}成等比,a1+a2=3,a3+a4=12,则a4+a5的值是(
1.已知全集U={1,2,3,4,5},集合M={1,2,3},N={3,4,5},则M∩(UN)=( )
A.{1,2} B.{4,5} C.{3} D.{1,2,3,4,5}
2.复数z=i2(1+i)的虚部为( )
A.1 B.i C.-1 D.- i
3.正项数列{an}成等比,a1+a2=3,a3+a4=12,则a4+a5的值是( )
A.-24 B.21 C.24 D.48
4.一组合体三视图如右,正视图中正方形
边长为2,俯视图为正三角形及内切圆,
则该组合体体积为( )
A.2 B.
C.2+ D.
5.双曲线以一正方形两顶点为焦点,另两顶点在双曲线上,则其离心率为( )
A.2 B.+1 C.D.1
6.在四边形ABCD中,“=2”是“四边形ABCD为梯形”的( )
A.充分不必要条件 B.必要不充分条件 C.充要条件\x09D.既不充分也不必要条件
7.设P在[0,5]上随机地取值,求方程x2+px+1=0有实根的概率为( )
A.0.2 B.0.4 C.0.5 D.0.6
8.已知函数ωx+φ)(x∈R,A>0,ω>0,|φ|
1.已知全集U={1,2,3,4,5},集合M={1,2,3},N={3,4,5},则M∩(UN)=( )A.{1,2} B.{4,5} C.{3} D.{1,2,3,4,5}2.复数z=i2(1+i)的虚部为( )A.1 B.i C.-1 D.- i 3.正项数列{an}成等比,a1+a2=3,a3+a4=12,则a4+a5的值是(
cdabccad