Question 23427
(-2m^4n^6)^2 
=4m^8n^12
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(-ab)(a^2b)^2
(-ab)(a^4b^2)
-a^5b^3
----------- 
5^3*(5a^4)^2
=5^3(5^2a^8)
=5^5a^8
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4^-2
=1/16
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11*11^-1 
=1
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5^4/5^1
=5^3
---------- 
36a^8b2/ab*(6/ab^2)^-1
I can't sort out your notation.

Cheers,
Stan H>