Bonsoir,je n'ai pas compris un exercice,le voilà: calcule en detaillant les etapes

B=6x[13- (5-2 )]
C=[(8-2)x8]÷4+8
D=[(31-5)-2x7]÷6÷2
E=3,4+[9x(8÷2)]÷6x7+2,6

Merci, d'avance... ♥
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