marhs calculs: Je ne parvient pas a résoudre ces calculs : Calcule et simplifie en notant les étapes intermèdiaires: 1) 4/5 + 6/2 2) 9/1 + 10/6 3) 3/7 + 7/3 4)

1) 4/5 + 6/2 = 4×2/5×2 + 6×5/2×5
=8/10 + 30/10 = 38/10 = 19 × 2/ 2×5 = 19/5

2) 9/1 + 10/6 = 9×6/1×6 + 10/6 = 54/6 + 10/6 = 54+10/6 = 64/6
32×2/3×2 = 32/3

1) 4/5+6/2
    = 4 x 2/5 x 2+6 x 5/2 x 5
    = 8/10+30/10
    =38/10
    = 19 x 2/5 x 2
    = 19/5

2) 9/1+10/6
   = 9 x 6/1 x 6+10 x 1/6 x 1
   = 54/6+10/6
   =64/6
   = 32 x 2/3 x 2
   = 32/3

3) 3/7+7/3
   = 3 x 3/7 x 3+7 x 7/3 x 7
   = 9/21+49/21
   = 58/21

4) 1/2-4/9
   = 1 x 9/2 x 9-4 x 2/9 x 2
   = 9/18-8/18
   =1/18

5) 3/4 / 2/1
  = 3/4 x 1/2
  = 3/8

6) 6/3 x 9/6 x 2/12
  = 3 x 2 x 3 x 3/3 x 3 x 2
  = 3 x 2/12
  = 3 x 2/6 x 2
  = 3/6
  = 3 x 1/3 x 2
  = 1/2

7) 7/4 x 8/6
   = 7 x 4 x 2/4 x 3 x 2
   = 7/3

8)






9)

10) 6/2 / 9/4
  = 6/2 x 4/9
  = 3 x 2 x 4/2 x 3 x 3
  = 4/3