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1-2i或-1+2i 1+2i或-1-2i -7-24i 7+24i
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standby bia xx-xx-xx-xx-xx standby use-bia xx-xx-xx-xx-xx standby ovmac xx-xx-xx-xx-xx standby use-ovmac xx-xx-xx-xx-xx
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ad-bc=0 ac-bd=0 ac+bd=0 ad+bc=0
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