Question

已知a等于一万b等于9999求括号a方加b方减2ab减括号6a减6b加九的值

Answer 1

(a²+b²-2ab)-(6a-6b)+9

=(a-b)²-6(a-b)+9

=(a-b)²-6(a-b)+3²

=(a-b-3)²

=(10000-9999-3)²

=(-2)²

=4