(-4)^{73} : 2^{144} - 25^{12} : 5^{23}= ? help pls.

Răspuns :

(-4)^ 73 : 2^144 - 25^12 : 5^23 =
(-2^2)^73 : 2^144 - (5^2)^12 : 5^23 =
(-2)^146 : 2^144  -5^24 : 5^23 =
(-2)^146-144  - 5^24-23 =
-2^2  - 5=
-4 - 5= -9
-2^146:2^144-5^24:5^23=-2²-5=-4-5=-9
as tricky  as that