Mathématiques

Question

A= 1/2+3/2 x 7/3+8/6                       
B= (1/2+3/2) x 7/3+7/2
C= 20/9-5/3 x 2/3+5/18
D= (20/9-5/3) x 2/3-1/27

2 Réponse

  • A = 1/2 + 3/2 * 7/3 +8/6
        =  1/2 + 21/6 +8/6
       = 1*3/2*3 + 21/6 +8/6
       = 3/6 +21/6+8/6
       = 32/ 6 = 16*2/3*2 = 16/3

    B= (1/2+3/2) * 7/3 + 7/2
     = 4/2 * 7/3+7/2
    = 28/6 + 7/2
    = 28/6+7*3/2*3 = 28/6 +21/ 6 = 49/6

    C= 20/9 -5/3 *2/3 +5/18
      = 20/9 - 10/9 +5/18
    = 10/9 +5/18 = 10*2 /9*2 +5/18 = 20/18 +5/18 = 25/18

    D = 20/9 -15/9 ) * 2/3 -1/27
     = 5/9 * 2/3 +1/27
      10/27 +1/27 = 11/27

  • A = 1/2 + 3/2 x 7/3 + 8/6
    A = 1/2 + 3 x 7 + 8/6
                   2 x 3
    A = 1 x 3 / 2 x 3 + 21/6 + 8/6
    A = 3/6 + 21/6 + 8/6
    A = 32/6
    A = 2 x 16 / 2 x 3
    A = 16/3
                        
    B = (1/2 + 3/2) x 7/3 + 7/2
    B = (4/2) x 7/3 + 7/2
    B = 4 x 7 + 7/2
          2 x 3
    B = 28/6 + 7/2
    B = 28/6 + 7 x 3 / 2 x 3
    B = 28/6 + 21/6
    B = 49/6

    C = 20/9 - 5/3 x 2/3 + 5/18
    C = 20/9 - 5 x 2 + 5/18
                     3 x 3
    C = 20/9 - 10/9 + 5/18
    C = 20 x 2 / 9 x 2 - 10 x 2 / 9 x 2 + 5/18
    C = 40/18 -20/18 + 5/18
    C = 25/18

    D = (20/9 - 5/3) x 2/3 - 1/27
    D = (20/9 - 5 x 3 / 3 x 3) x 2/3 - 1/27
    D = (20/9 - 15/9) x 2/3 - 1/27
    D = 5/9 x  2/3 - 1/27
    D = 5 x 2 - 1/27
           9 x 3
    D = 10/27 - 1/27
    D = 9/27
    D = 9 x 1 / 9 x 3
    D = 1/3

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