On a 2.... Pergunta de ideia dewiduuuuh

widuuuuh @widuuuuh

June 2022 1 71 Report

On a 2<x<6 et - 4<y<-2
Montrer que -4<xy+4x+y<8
(encadrement) merci de m'aider !

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marcodelafontaine

2<x<6 et - 4<y<-2

2*-4<xy<6*-2

-8<xy<-12

-8+8<xy+4x<-12+24

0<xy+4x<12

0-4<xy+4x+y<10

-4<xy+4x+y<10

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