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Sagot :

4a-5=4b-5 donne 4a=5b

                    donc a=5/4*b

 

4a-5<4b-5 donne 4a<5b

                    donc a<5/4*b

 

4a-5>4b-5 donne 4a>5b

                    donc a>5/4*b

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