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Exo 1

5^-7×5^-3

=5^-7-3

=5^-10

6^12-6^-10

=6^12-10

=6^2

21^-13/21^10

=21^-13-10

=21^-23

-5^4/5^3

=5^4-3

=5^1

(8^3)^2

=8^3×2

=8^6

Ex2

2^-4×2^9 / 2^5×2^-7

=2^-4+9 / 2^5-7

=2^5 / 2^-2

=2^5-(-2)

=2^5+2

=2^7

((-3)^4)^-2×(-3) / (-3)^-3

=(-3^-8)×(-3) / -3^-3

=3^-8×3^1 / 3^3

=3^-8+1 / 3^3

=3^-7-3

=3^-10

((7^13×(7^-9))/(7^-14×(7^-8))^2

=((7^13-9))/(7^-14-8))^2

=((7^4)/(7^-22))^2

=((7^4-(-22))^2

=((7^4+22))^2

=(7^26)^2

=7^52

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