Bonsoir;
a)
aire du rectangle:
FGLK
L = x-2
l = x-3
(x-2) (x-3)
x² -3x -2x +6
= x² -5x +6
b)
x = 6
x² -5x +6
= 6² -5*6+6
= 36-30+6
= 12cm²
c)
à x-3
2)
aire du carré - aire du rectangle
(x*x) - (x² -5x +6)
= x² -x² +5x -6
= 5x-6
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Bonsoir;
a)
aire du rectangle:
FGLK
L = x-2
l = x-3
(x-2) (x-3)
x² -3x -2x +6
= x² -5x +6
b)
x = 6
x² -5x +6
= 6² -5*6+6
= 36-30+6
= 12cm²
c)
à x-3
2)
aire du carré - aire du rectangle
(x*x) - (x² -5x +6)
= x² -x² +5x -6
= 5x-6