Simplifie les expressions algébriques suivantes et détermine leur valeur numérique si a=2 , b=5 , c=-1 , d=-8 , x=3 et y=0. C) 1/3ab - 4/5cd + 1/2ab + 1/5cd - 3/4 + 5/3ab

D) 0,6x - 0,7y + 1/5x + 0,8y - 3,1y + 3/4x

E) 5xy - 3/4xy - 4/5xy + 3xy - 7xy
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