Question

(а-1)(a+1)+b2-2ab
решите
при а=123
b=-876

Answer 1

(a-1)(a+1)+b²-2ab=a²-1+b²-2ab=a²-2ab+b²-1=(a-b)²-1
a=123 b=-876
(123-(-876))²-1=999²-1=998001-1=99800