3. Simplify :
2^-3 x5^-3 x10^2 x 25÷
5^4 ×2^-5
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==> 2^(-3) × 5^(-3) × 10 ^2 × 5 ^2 ÷ 5 ^4 × 2^(-5)
==> 2^(-3) ×5^(-3) × 10 ^2 × 5^2 × 2^(-5)
==> 2 ^(-8) × 5^(-1) ×10 ^2
==> 100 ^(-7)
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