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设复数z1=1+i,z2=x+2i(x∈R),若z1z2为实数,则x等于
-2
-1
1
2
设复数z1=1+i,z2=x-i(x∈R),若z1·z2为实数,则x等于
A.-2
B.-1
C.1
D.2