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해법
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The 원둘레 of a circle is 16pi kilometers. What is the area?Twice a number added to 5 is equal to 15 . What is the number?7000 are invested in a bank account at an interest rate of 4 percent per year.Find the amount in the bank after 9 years if interest is compounded quarterly78 is 45 percent of what numberThe 차이 between the squares of two consecutive odd numbers