25 traise to minus 4divided by 5 raised tominus 3×10 raised tominus 2
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25^-2 ÷ 5^-3 ×10^-2
((5)^2)^-2 ×5^3 ×(2×5)^-2
5^-4 × 5^3 × 2^-2 ×5^-2
using (a^m×a^n ) = (a^m+n)
5^-4+3+(-2) × 2^-2
5^-3 × 2^-2
1/125 × 1/4
1/500
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