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Sagot :

Bonjour,

1) (d+2)²+(d+2)(d-3)

2) (d+2)²+(d+2)(d-3) = (d+2)(d+2)+(d+2)(d-3)

                                = (d+2)[(d+2)+(d-3)]

                                = (d+2)(2d-1)

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