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(-2/7)^-4 × ( -5/7)^2
=(-7/2)^4. × (-5/7)^2
= (-7×7×7×7/2×2×2×2) × (-5×5/7×7)
= (-7×7/16) × (-25)
= (-49/16) × (-25)
= 49×25/16
= 76.5625
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