Développe et réduis chaque expression :
a) 2(x+5)
b) 7(2-3x)
c) 4x(5+x)
d) -2(7-2x)
e) 5x(3x+4)
a) 2(x+5)
b) 7(2-3x)
c) 4x(5+x)
d) -2(7-2x)
e) 5x(3x+4)
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Réponse :
*=multiplié
a) 2*x+2*5 = 2x+10
b) 7*2-7*3x = 14-21x
c) 4x*5+4x*x = 20x+4x²
d) -2*7-(-2)*2x = -14+4x
e) 5x*3x+5x*4 = 15x²+20x