Math Problem Statement
- D´emontrer les propositions suivantes : (a) Pour tous r´eels x et y, on a : x + y 6= −1 ou xy 6= 1. (b) Pour tous r´eels x et y, si x 6= 0 et y 6= 0 alors xy 6= 0. (c) Pour tous r´eels positifs x et y, si x 1 + y = y 1 + x alors x = y
Solution
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Math Problem Analysis
Mathematical Concepts
Algebra
Quadratic Equations
Positive Real Numbers
Contrapositive Proof
Formulas
x + y = -1
xy = 1
x / (1 + y) = y / (1 + x)
Quadratic discriminant Δ = b^2 - 4ac
Theorems
Quadratic Equation Theorem
Contrapositive Logic
Symmetry of Equations
Suitable Grade Level
Undergraduate Mathematics
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