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Step-by-step explanation:
a)[(8/3)4]^-2
=(8/3)^4×-2
=(8/3)^-8=(3/8)^8
b)(-2/7)^-3×(-2/7)^-4
=(-2/7)^-3+(-4)
=(-2/7)^-7=(-7/2)^7
c)(11/12)^-4×(11/12)^-2
=(11/11)^-4+(-2)
=(11/12)^-6=(12/11)^6
d)(12/5)^-5×(25/8)^-5
=(5/12)^5×(8/25)^5
=(5/12×8/25)^5
=(1/2×3/5)^5
=(3/10)^5
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