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Settlement km - calculator, model in Poland

jak obliczyć kilometrówkę?
Calculator allows you to calculate the costs that can be refunded for use of a personal vehicle for business purposes.
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Life

Calculator position of geostationary satellites.

Calculator generates an optimized antenna for receiving satellite television signals from a communications satellite wybrango.    
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Math

Number cheerful

Checks the calculator is a large number of so-called gay (Happy Number). Number gay is a natural number is defined as follows: Calculate the sum of squares of digits of the number. Repeat this process for the next results as long as we get the number 1 or the results will be repeated. If you have received as a result of one, the original number is the number of gay. Otherwise, a number bleak.    
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Statistical calculator

Calculator allows to determine the basic statistical parameters such as standard deviation, arithmetic mean, variance, and median for the values.
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Math

Area of ​​a rectangle

The calculator can calculate the area of a ​​rectangle.