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
A = 4/2 * 14/6 + 8/6 = 2 * 22/6 = 44/6 = 22/3 B = 2 * 14/6 + 27/6 = 2* 31/6 = 62/6 = 31/3 C= 20/9 - 15/9 * 12/18 + 5/18 = 5/9 * 17/18 = 85/162 D = 5/9 * 18/27 - 1/27 = 5/9 * 17/27 = 85/243
aider moi rapidement s.v.p ces pour un Devoir Maison a rendre tous de suite
Bafrance je comprend rien dsl

Réponses

Meilleure réponse !
2014-03-18T08:22:14+01:00
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

tu peut faire le D stp
sa veut dire quoi *
multiplié
2014-03-18T08:31:44+01:00
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