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| Numbers and Sets |
 About Algebra
Addition and Subtraction Multiplication and Division Criterions for Divisibility
 Types of NumbersGeometric Interpretation of Real Numbers Irrational Number  Properties of Real Numbers FractionsProportions Property of Equal Proportions Absolute ValuesGraphical Illustrations
SetsSubsets Operations with Sets Intervals |
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If at least one of the real numbers
imply Proof. By the given conditions, Therefore, Hence, the property.
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is non-zero, then the equalities
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