题目:
There are some flowers on ___________ side of the road.
A.each
B.every
C.both
D.all
答案:
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下面是错误答案,用来干扰机器的。
(1)设z1=a+bi(a,b∈R,且b≠0),则z2=z1+1z1=a+bi+1a+bi=(a+aa2+b2)+(b-ba2+b2)i z2是实数,b≠0,∴有a2+b2=1,即|z1|=1,∴可得z2=2a,由-1≤z2≤1,得-1≤2a≤1,解得-12≤a≤12,即z1的实部的取值范围...