simplify with rules for ex-a^n.a^m
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8) 15 a^40 b^30. a^6 b^6
=15a^(40+6). b^(30+6)
=15a^46 b^36.
9) 5^8/5^3 =5^(8-3)=5^5
(3/4)^-3=(4/3)^3=4^3 /3^3=64/27
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