(1)4^-2 *4^2
=1/16*16
=1
(2)-2.5*10^-4
=-2.5*1/10000
=-0.000025
(3)(3/10)^3∕(3/10)^4
=(3/10)^-1
=10/3
(4)(-2)^5∕2^8
=-2^-3
=-1/8
(1)4^-2 *4^2
=4^2/4^2
=1
(2)-2.5*10^-4
=-(5/2*1/10000)
=-1/2000
(3)(3/10)^3∕(3/10)^4
=(3/10)^-1
=10/3
(4)(-2)^5∕2^8
=-(2^5∕2^8)
=-(1/2^3)
=-1/8