bonjour
ex 5
1
AB = 2x+3 et AD = x+4
si x = 6
alors AB = 2*6+3 = 15
et AD = 6+4 = 10
puis 2
P = 2*(2x+3) + 2*(x+4)
= 4x+6 + 2x+8 = 6x+14
P = 41 si 6x+14 = 41
donc 6x = 27
x = 27/6 = 4,5
enfin 4
A = long x larg = (2x+3) (x+4) = 2x²+8x+3x+12 = 2x²+11x+12
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bonjour
ex 5
1
AB = 2x+3 et AD = x+4
si x = 6
alors AB = 2*6+3 = 15
et AD = 6+4 = 10
puis 2
P = 2*(2x+3) + 2*(x+4)
= 4x+6 + 2x+8 = 6x+14
puis 2
P = 41 si 6x+14 = 41
donc 6x = 27
x = 27/6 = 4,5
enfin 4
A = long x larg = (2x+3) (x+4) = 2x²+8x+3x+12 = 2x²+11x+12