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Verifier numbers Postnet

Calculator allows you to verify the number entered Postnet.          


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Verification ISBN preview

Jak sprawdzić numer ISBN?
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Calculator allows you to verify the ISBN number entered.
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Verification of the social security number in Poland

It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
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Verifier numbers EAN-13 preview

 Verifier numbers EAN-13 Calculator allows you to verify the number entered EAN-13.          
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The harmonic mean

Calculator based on the entered numbers separated by commas calculate the harmonic mean.        
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Number of tetrahedral

Tetrahedral numbers are the natural numbers, for which it is possible to construct a tetrahedron formnego of bullets. They are a special case of the pyramidal numbers.        
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Area of ​​a rectangle

The calculator can calculate the area of a ​​rectangle.
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ROCE - an indicator of the efficiency of investment

The calculator calculates ROCE on the basis of these pre-tax profits, total capital and current liabilities ROCE (called Return On Capital Employed) - an indicator of the efficiency and profitability of the investment, which is the capital of the company involved.