c mon dm de math je coprent rien.

ex1 simplifier 3*5*a 12+4*5*x 12+5+3*y 1.2*5*(2*a+5) 2*x+3*5)+t

ex2 on done a =2*x+3*y-4. calculer a pour: x=2 y=5. et pour x=4.5 et y=4

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