(5/7)^3×(5/7)^-6×(1/3)^-2×(3/5)^-2
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(5/7)^3×(5/7)^-6×(1/3)^-2×(3/5)^-2
= (5/7)^3×(7/5)^6×(3)^2×(5/3)^2
= (7/5)^3×(5)^2
= (7)^3/5
= 343/5
= 68.6
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