Réponse:
attention :
x : la lettre
× : le signe mathématiques de la multiplication
a. -6x + 13
b.-5+ (4+2x) = -5×4 + -5×2x = -20 -10x
c. (10× -x + 10×3) + (-3x+6) = -10x + 30 -3x +6 = -7x + 36
d.(5+2x) +(7+7x) = 35+35x+14x+14xcarré = 14xcarré + 49x +35
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