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= (p^4 q^2 / 4) x (-2^3 / p^6 q^3)
= -2^3 / 4p^2 q
= -8 / 4p^2 q
= -2 / p^2q
.
2.) (2a^4)^2 / b^7 : (a^2)^-3 / 2b
= 4a^8 / b^7 : (a^-6) / 2b
= 4a^8 / b^7 x 2b / a^-6
= 4a^14 / b^7 x 2b
= 4a^14 / b^6 x 2
= 8a^14 / b^6