Réponses

  • Utilisateur Brainly
2013-05-19T19:41:10+02:00

1) A=aire(ABCD)=AB*AD=

 

2) si x=2+√2

alors A=(2+√2)²

             =2²+2*2*√2+(√2)²

             =4+4√2+2

             =6+4√2

 

3) x>1 et BE=0,5

donc A'=aire(ECF)=EC*CF/2

             =(x-0,5)*4/2

             =2x-1

 

4) S=A+A'

        =x²+2x-1

 

5) si x=2+√2

alors S=(2+√2)²+2(2+√2)-1

             =6+4√2+4+2√2-1

             =9+6√2

2013-05-19T19:57:10+02:00

a) aire d'un carré = cxc

                                =ABxAD

                                =x²

 

b) A=(2+racine carré2)²

             =2²+2 x 2 x racine carré2+(racine carré2)²

             =4+4racine carré2+2

             =6+4racine carré 2

 

c) A'=aire(ECF)=EC x CF/2

             =(x-0,5) x 4/2

             =2x-1

 

d) S=x²+2x-1

 

c) S=(2+racine carré2)²+2(2+racine carré2)-1

             =6+4racine carré2+4+2racine carré2-1

             =9+6racine carré2