Bonjour,
développer:

B: (4×-7)(2×+3)-(2×-5) au carré
C: (3x-2)(3×+2)-(×+4) au carré

factoriser:

D: 16x au carré -25
E: (4×-7)(2×+3)-(2×+3) au carré
F: (3×+1) au carré - (2×+4)(3×+1)

factoriser en deux étapes:
H: (2×-5)(3×+7)-(9× au carré - 49)

merci beaucoup d'avance.​
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