the answer for this question .
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. b)(3)^5x(5/3)^7=3^5x5^7/3^7=
5^7/3^2 = 78125 / 9
d) 2^-6x(-7)^-2=I/2^6x1/7^2 = I/(64x49) = I/3136
f) 6^-3x(-5)^-3=1/6^3x I/-5^3
= I/216x1/-125.=-I/27000
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Simple sum
Hope you can varify
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