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(1)∵複數z=m2-1+(m2-m-2)i是實數,∴m2-m-2=0,∴m=-1.m=2(2)複數z=m2-1+(m2-m-2)i是虛數,∴m2-m-2≠0∴m≠-1.m≠2(3)複數z=m2-1+(m2+3m+2)i是純虛數∴m2-m-2≠0且m2-1=0∴m=1.
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