题目内容
(理)设复数:z1=1+i,z2=x+2i(x∈R),若z1z2为实数,则x=
A.-2
B.-1
C.1
D.2
(理)设z1,z2是非零复数满足z12+z1z2+z22=0,则()2+()的值是
A.-1
B.1
C.-2
(08年濮阳市摸底考试理) 设复数z1=1+i,z2=z+2i(z∈R),若z1z2为纯虚数,则x= ( )
A.-2 B.-1 C.1 D.2