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x=a+bi,a,b是實數 √(a^2+b^2)=1+3i-a-bi=(-a+1)+(-b+3)i 左邊是實數,所以右邊也是實數 所以-b+3=0 b=3 所以√(a^2+9)=-a+1 a^2+9=a^2-2a+1 a=-4 x=-4+3i
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