① （-2）^2003 *（-0.5）^2004
= （-2）^2003 *（-0.5）^2003 * (-0.5)
= [(-2) * (-0.5)]^2003 * (-0.5)
= 1^2003 * (-0.5)
= -0.5
② （-2）^100+（-2）^101
= （-2）^100+（-2）^100 * (-2)
= (-2)^100 * [1+(-2)]
= - 2^100