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Sagot :

Bonjour,

[tex]H=(-3f-2)(-7g-f)\\H=[(-3f)*(-7g)]+[(-3f*(-f)]+[(-2)*(-7g)]+[(-2)*(-f)]\\H=21fg+3f^2+14g+2f\\H=3f^2+21fg+14g+2f[/tex]

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