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a²;+b²;2a-4b+16 =(a²;+2a+1)+(b²;-4b+4)+11 =(a+1)²;+(b-2)²;+11 ∵(a+1)²;≥0,(b-2)²;≥0 ∴當a+1=0,a=-1 b-2=0,b=2時 (a+1)²;+(b-2)²;+11≥11 此代數式的最小值是11.
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