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∵a+b+c=1 ∴c=1-a-b ∵a²+b²+c²=1/2 ∴2b²+(2a-2)b+(2a²-2a+1/2)=0 ∴△=4a²-8a+4-16a²+16a-4=-12a²+8a≥0 ∴0≤a≤2/3
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