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Rational numbers are using rational numbers while irrational are not rational,that`s simple!

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A rational number is a real number that can be written as a simple fraction. 

     is a rational number 1.75 = 7/4   it can be written a fraction 
                                   1 .75 = 7/4 <--- is a ratio
An irrational number is a real number that cannot be written as a simple fraction.
                                       Pi = 3.14159....... is it a no ratio
                                  That is a irrational numbers                      
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