Bonjour!Je n'est pas bien compris cette formule:simplifier les expressions littérales suivantes:

A=1 x c+0 x d+e x f
A=1c+0d+ef
A=c+0+ef
A=c+ef

B=4 x X+3 x X +7-3
B=4X +3X +7-3
B=(4+3)x X +7-3
B=7X +4
Je ne comprend pas bien la 3eme colonne des 2 exemples,merci!

B=
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