Simplify : (3^10÷ 3^7)×3-5
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(3^10÷ 3^7)×3^-5
= 3^(10-7) × 3^-5
= 3^3 × 3^-5
= 3^(3-5)
= 3^-2
= 1/3^2
= 1/9
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