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Simplify each of the following expressions leaving your answer in index form.
(a) #3^3×3^4#
(b) #5^2×5^(-3)#
(c) #3^(3/2)×3^(-3/4)×3^(1/4)#
(d) #6^2×7^(-4)×(8^(-2))^2×6^3×7^2×8^4#