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Answer :

5 to the power of 4 is 5.5.5.5 not 5.4
Same mistake for the other ones
The correct answer:
=(5.5.5.5.5.5.5)/(5.5)
=5.5.5.5.5
=5^5
Five to the power of 5
If the 5^4 ( 5 to the power of 4 ) and the 5^3 have to be in expanded form then it should be 5x5x5x5 and 5x5x5 not 5x4 and 5x3. Same goes for the 5^2