1.

If ∣∣∣∣1xxx1xxx1∣∣∣∣2=∣∣∣∣∣1−2x2−x2−x2−x2−1x2−2x−x2x2−2x−a∣∣∣∣∣, then the value of a is

Answer» If
1xxx1xxx1
2
=

12x2x2x2x21x22xx2x22xa

,
then the value of a is


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