(6/7)²(6/5)-³(7/5)²
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=2^2/7^2×3^3/7^3÷{(7/5)^-2×-4}
=2^2/7^2×3^3/7^3÷{(7/5)^8}
=2^2/7^2×3^3/7^3÷{7^8/5^8}
=2^2/7^2×3^3/7^3×5^8/7^8
=(2^2×3^3×5^8)/(7^5×7^8)
=(2^2×3^3×5^8)/(7^13)
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