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第三章 数系的扩充与复数的引入,3.2.2 复数代数形式的乘除运算,第三章 数系的扩充与复数的引入,（acbd）（adbc）i,z2z1,z1（z2z3）,z1z2z1z3,相等,互为相反数,abi,

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