若A?B=5A-4B,已知x?(5?2),

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若A?B=5A-4B,已知x?(5?2),
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若A?B=5A-4B,已知x?(5?2),
若A?B=5A-4B,已知x?(5?2),
 

若A?B=5A-4B,已知x?(5?2),