简便运算: (9-10)*(10-11)*(11-12)*…*(108-109);

问题描述:

简便运算: (9-10)*(10-11)*(11-12)*…*(108-109);

解:
(9-10)*(10-11)*(11-12)*…*(108-109);
=(-1)(-1)(-1)(-1)...(-1)
=(-1)^(108-9+1)
=(-1)^100
=1