(-2)^2002 + (-2)^2003
= 2^2002 - 2^2003
= (1 - 2)(2^2002)
= (-1)(2^2002)
= -(2^2002)
如果看看简单的
(-2)^4 + (-2)^5
= 16 - 32
= -16
= 2^4 - 2^5
= (1 - 2)(2^4)
= -(2^4)