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令Z=x+yi 由題意知 z+z0=(3+x)+(2+y)i 3z+z0=(3x+3)+(3y+2)i 實部虛部分別相等 3+x=3x+3 x=3x x=0 2+y=3y+2 y=3y y=0 這個複數就是0
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