(a – b)2 = a2 – 2ab + b2.
Примеры.
(x – 2)2 = x2 – 4x + 4.
992 = (100 – 1)2 = 1002 – 2 ⋅1 ⋅ 100 + 12 = 10000 – 200 + 1 = 9801.
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