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【简答题】
（1）设 及 分别与复数z 1 =5+3i及复数z 2 =4+i对应，计算z 1 -z 2 ，并在复平面内作出 ； （2）设 及 分别与复数z 1 =1+3i及复数z 2 =2+i对应，计算z 1 +z 2 ，并在复平面内作出 。
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