616,161×39-393,939×61简便计算？

Question

我想不会这一道题。

Answer 1

616,161×39-393,939×61
【提取公因数61】
=61x(111x39-393,939)
【提取公因数39】

=61x39x(111-111)
= 61x39x0
=0

Answer 2

=10101*61*39-10101*39*61
=0