Determine whether various combinations of rational and irrational numbers are rational or irrational themselves.
7583_Recognizing_rational_irrational_expressions_unknowns_.html
7579_Proof_sum_product_of_two_rationals_is_rational.html
7581_Proof_sum_of_rational_irrational_is_irrational.html
7580_Proof_product_of_rational_irrational_is_irrational.html
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