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若复数(α∈R)是纯虚数(i是虚数单位),则a= .
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高三上学期数学《》真题及答案
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设a∈R.复数i为虚数单位是纯虚数则a的值为__________.
若复数z=a∈Ri是虚数单位是纯虚数则复数3﹣z的共轭复数是
3+i
3﹣i
3+2i
2﹣i
.i是虚数单位若复数1-2ia+i是纯虚数则实数a的值为________.
若复数a∈R.为纯虚数其中i为虚数单位则a=
﹣3
﹣2
2
3
若复数z是纯虚数且1﹣iz=a+ia∈Ri是虚数单位则a=
﹣2
﹣1
1
2
若复数a-2+ii是虚数单位是纯虚数则实数a=.
若复数1+2i1+ai是纯虚数i为虚数单位则实数a的值是.
若复数a∈R.i是虚数单位是纯虚数则实数a的值为
﹣3
3
﹣6
6
若复数z=x+i1+i是纯虚数其中x为实数i为虚数单位则z的共轭复数=.
若复数a∈R.i是复数单位是纯虚数则实数a=________.
若复数z是纯虚数且1﹣iz=a+ia∈Ri是虚数单位则a=
﹣2
﹣1
1
2
若复数+mi为虚数单位为纯虚数则实数m=.
设i是虚数单位若复数a﹣a∈R是纯虚数则a的值为
﹣3
﹣1
1
3
设i是虚数单位若复数a+a∈R是纯虚数则a等于
-1
1
-2
2
若复数a2-l+a-1ii为虚数单位是纯虚数则实数a=
±1
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0
1
若复数z=i是虚数单位是纯虚数则实数m的值是________.
若复数z=a2﹣4+a﹣2ia∈R是纯虚数则|z|=
若复数z=1-im+2ii为虚数单位是纯虚数则实数m的值为.
设i是虚数单位若复数a-a∈R.是纯虚数则a的值为
-3
-1
1
3
若复数a∈R.i为虚数单位是纯虚数则实数a的值为
-2
4
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关于函数fx=|x﹣1|﹣1的下列结论错误的是
直线2x+y﹣3=0与圆x2+y2﹣2x﹣2y=0相交于AB两点O为坐标原点则.
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2=0与曲线C交于AB两点则|AB|的最小值为
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已知函数y=sinωxω>0在0上有最大值没有最小值则ω的取值范围为.
已知集合P={012}Q={x|x<2}则P∩Q=
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
过椭圆C+=1a>b>0的左焦点F的直线过C的上端点B且与椭圆相交于另一个点A若|BF|=3|AF|则C的离心率为.
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