Power operation 1.25^m÷5^m=( ) 2.-y^3n+1÷y^n+1 3.(x-y)^5 X (x-y)^4= -( )^3

Power operation 1.25^m÷5^m=( ) 2.-y^3n+1÷y^n+1 3.(x-y)^5 X (x-y)^4= -( )^3

5^m
-y^2n
(y-x)^3