Bonjour,
a. On utilise la formule: Aire= Longueur * Largeur.
On a donc: A₁=(2x-3)*(8x-4)
A₂=(x+5)*(8x-4).
b. L'aire totale est de: A=A₁+A₂
=[(2x-3)*(8x-4)]+[(x+5)*(8x-4)]
c. A=[(2*4-3)*(8*4-4)+[(4+5)*(8*4-4)}
= 20*252
A1 = (8x-4)( 2x-3)
= 16x² -24x -8x +12
= 16x² -32x +12
A2 =(x+5) ( 8x-4)
= 8x² -4x +40x -20
= 8x² +36x -20
b)
A = 16x² -32x +12+8x² +36x -20
= 24x²+4x -8
c)
A1 = 16*36 -32*6 +12
= 576 -192 +12
= 396
A2 = 8*36 +36*6 -20
= 288 + 216 -20
= 484
A= 24*36 + 4*6 -8
= 864 +24 -8
= 880
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Bonjour,
a. On utilise la formule: Aire= Longueur * Largeur.
On a donc: A₁=(2x-3)*(8x-4)
A₂=(x+5)*(8x-4).
b. L'aire totale est de: A=A₁+A₂
=[(2x-3)*(8x-4)]+[(x+5)*(8x-4)]
c. A=[(2*4-3)*(8*4-4)+[(4+5)*(8*4-4)}
= 20*252
Bonjour,
A1 = (8x-4)( 2x-3)
= 16x² -24x -8x +12
= 16x² -32x +12
A2 =(x+5) ( 8x-4)
= 8x² -4x +40x -20
= 8x² +36x -20
b)
A = 16x² -32x +12+8x² +36x -20
= 24x²+4x -8
c)
A1 = 16*36 -32*6 +12
= 576 -192 +12
= 396
A2 = 8*36 +36*6 -20
= 288 + 216 -20
= 484
A= 24*36 + 4*6 -8
= 864 +24 -8
= 880