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12.復(fù)數(shù)z=a+bi,a,b∈R,且b≠0,若z2-4bz是實(shí)數(shù),則有序?qū)崝?shù)對(duì)(a,b)可以是 .(寫出一個(gè)有序?qū)崝?shù)對(duì)即可)
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