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设复数z1=1+i,z2=2+bi,若为实数,则实数b=A.-2B.-1C.1D.2
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设复数z
1=1+i,z
2=2+bi,若
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAxCAYAAADukUiUAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAOBJREFU
SEvtVdsNwyAMdFf2Ot7Ec3gKlnAxAYppgsUfUouUj8hcfHd+5KX5wM4xwM6BncuFzZEAUQIwp+qD
yumZKKiISo0nRsXVbSdaSIEadJXBYokVkXXBpH8h22oaqNOKbAbGQWTKekqapIzNBP8x66KPQ5VW
YupOCeX4QDeutOkbKMeASWMMyBloqE0IEPZ2LwFW+bmWjwDfJqJcad0CipUPDRlqmCt/IsCLm8X6
93O3RjRjPn5iHa6t8d98vVI2efM2v918137GMqZfgFVj3P0vwjXzUxmarbO1Bw7QG8H0WyGH2E+W
AAAAAElFTkSuQmCC
)
为实数,则实数b=( )
A.-2
B.-1
C.1
D.2
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