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问题
选择题
复数z=a+bi(a,b∈R)为纯虚数,则 [ ]
A.a=0
B.b=0
C.a=0且b≠0
D.a≠0且b=0
答案
答案:
C
选择题
China wants _____ greater say in the decision-making of the International
Monetary Fund, and tougher regulations on _____ financial system in wealthy countries to prevent future problems.
A.a; the
B.the; 不填
C.the; the
D.a; 不填
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填空题
计算:(x
2
-1)(
1
x-1
-
1
x+1
)的结果是______.
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