Répondre :
Bonsoir;
1)
FGBA = 7*3= 21
DCGE = 3*3 = 9
total
21+9 => 30cm²
2)
FGBA = 7*x = 7x
DCEG = x*x = x²
partie grisée:
(7x+x² )cm²
Bonsoir;
1)
FGBA = 7*3= 21
DCGE = 3*3 = 9
total
21+9 => 30cm²
2)
FGBA = 7*x = 7x
DCEG = x*x = x²
partie grisée:
(7x+x² )cm²