-2的99次方*-1/2的100次方+8的101次方*-0.125的100次方
=（-2）^99*(-1/2)^99*(-1/2)+8*8^100*(-0.125)^100
=[(-2)*(-1/2)]^99*(-1/2)+8*[8*(-0.125)]^100
=1^99*(-1/2)+8*[-1]^100
=-1/2+8
=15/2