Mathématiques

Question

Help please je galère ! merci d'avance :)
Help please je galère ! merci d'avance :)

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2 Réponse

  • a) [tex]4(x+5)=10x+3 \\ 4x+20=10x+3 \\ 20-3=10x-4x \\ 17=6x \\ 17/6=x[/tex]


    b) [tex]3(x-2)=6(x+4) \\ 3x-6=6x+24 \\ -6-24=6x-3x \\ -30=3x \\ -30/3=x \\ -10=x[/tex]


    c) [tex]7x - (5x + 3) = 5(x - 3) + 2 \\ 7x-5x-3=5x-15+2 \\ -3+15-2=5x+5x-7x \\ 10=3x \\ 10/3=x[/tex]


    d) [tex]7(n+2)-3=25-(3n+4) \\ 7n+14-3=25-3n-4 \\ 7n+3n=25-4-14+3 \\ 10n=10 \\ n=10/10 \\ n=1[/tex]


    e) [tex]4y+3(4y-2)=3(y+1) \\ 4y+12y-6=3y+3 \\ 4y+12y-3y=3+6 \\ 13y=9 \\ y=9/13[/tex]

  • a) 4(x+5) = 10x+3 
    4x+20 = 10x+3 
    20-3 = 10x-4x 
    17 = 6x 
    x = 17/6 
    b) 3(x-2) = 6(x+4) 
    3x-6 = 6x+24 
    -30 = 3x 
    x= -30/3 = -10 
    c) 7x-(5x+3) = 5(x-3)+2 
    7x-5x-3 = 5x-15+2 
    -3+15-2 = 5x-7x+5x 
    10 = 3x 
    x = 10/3 
    d) 7(n+2)-3 = 25-(3n+4) 
    7n+14-3 = 25-3n-4 
    7n+3n=25-4-14+3 
    10n = 10 
    n=10/10 
    n=1 
    e) 4y+3(4y-2) = 3(y+1) 
    4y+12y-6 = 3y+3 
    13y = 9 
    y = 9/13

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