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Answer:

a) 3^2×3^2

=3^(2+2)

=3^4

b)7×7^4

=7^(1+4)

=7^5

c)10^9÷10^7

=10^(9-7)

=10^2

d)5^8÷5

=5^(8-1)

=5^7

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