Six simple calculation problems most commonly used in Java
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Java
1. Three white balls, three red balls, six black balls, randomly take out eight balls and calculate all the results
2. Digital pyramid
3. Simply judge whether the date format is correct
4. Calculate the sum of the first 20 items of 1 + 2 / 3 + 3 / 5 + 4 / 7 + 5 / 9
5. Give the principal, interest rate and years to calculate the deposit (as a function)
6. Calculate the area of the Pentagon. Enter r to find the area s
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