如题所述
12-11-10+ 9 +8-7-6 +5 +4-3-2+1=0 12 +11 +10 +1 +2 +3-9-8-7-6-5-4=0 12-11-1+ 10-8-2 +9-7-6 +5-4 +3=0 12-10-2 +11-8-3 +9-5-4 +7-6-1=0
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