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若c = 0,則秩為1 若c!=0(不等於0):兩種情况: 若ac = bc = 0(即b = a = 0),此時矩陣的所有2階子式都是0,所以秩仍為1 否則(a!=0或b!=0),矩陣有非零的2階子式,故其秩為2.
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