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........................-example-1
User Reojased
by
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1 Answer

2 votes
Use:

a^(-n)=(1)/(a^n)


20\cdot5^(-2)=20\cdot(1)/(5^2)=(20)/(25)=(20:5)/(25:5)=(4)/(5)
Answer: B. 4/5

User Nawlbergs
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