Question

要求简便运算.(a+b)^3\(a+b)-(a-b)^3\(a-b)

Answer 1

(a+b)³/(a+b)-(a-b)³/(a-b)

=(a+b)²-(a-b)²

=[(a+b)-(a-b)]x[(a+b)+(a-b)]

=(a+b-a+b)x(a+b+a-b)

=2bx2a

=4a