已知a+b=-8,ab=12,则(a-b) 2 = ___ .

2024-11-18 19:54:25
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回答1:

(a-b) 2 =(a+b) 2 -4ab
∵a+b=-8,ab=12,
∴原式=(-8) 2 -4×12,
=64-48,
=16.