Solve it please its urgent
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Step-by-step explanation:
1.(5/7)^2×-1=(5/7)^-2×-5=(5/7)^10
2.(2/7)^2×(7/2)^-3÷ (7/5)^-2×-4
(2/7)^2×( 2/7)^3÷(7/5)^8
(2/7)^5÷(7/5)^8
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