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Réponse :

Bonjour

Explications étape par étape

A =3/2 + 4/5

A = 15/10 + 8/10

A = 23/10

B = 13/15 - 3/5

B = 13/15 - 9/15

B = 4/15

C = 35/4 * (-28)/5

C = 7*5*(-7)*4/4*5

C = -49

D = 7/10 : 3/5

D = 7/10 * 5/3

D = 7 * 5/5 * 2 * 3

D = 7/6

E = (12/7 + 8/7) * 4/5

E = 20/7 * 4/5

E = 5 * 4 * 4 / 7 * 5

E = 16/7

F = 5/8 * (3/4 + 7/4)

F = 5/8 * 10/4

F = 5 * 5 * 2/8 * 2 * 2

F = 25/16

G = 7 * (3 + 5/7)

G = 7 * (21/7 + 5/7)

G = 7 * 26/7

G = 26*7/7

G = 26

H = (1/2 + 3/4) : 2/3

H = (2/4 + 3/4) : 2/3

H = 5/4 : 2/3

H = 5/4 * 3/2

H = 15/8

I = (12/7 + /8/7) : (7/5 - 1/5)

I = 20/7 : 6/5

I = 20/7 *  5/6

I = 2 * 10 * 5 / 7 * 3 * 2

I = 50/21

J = 1 - (1/6 + 5/12)

J = 1 - (2/12 + 5/12)

J = 1 - 7/12

J = 12/12 - 7/12

J = 5/12

K = 2/3 * 7/5 - 4/15

K = 14/15 - 4/15

K = 10/15

K = 5 * 2/5 * 3

K = 2/3

L = 3/4 : 4/5 + 7/2

L = 3/4 * 5/4 + 7/2

L = 15/16 + 7/2

L = 15/16 + 56/16

L = 71/16

M = 1/2 + 5/2 * 7/10

M = 1/2 + 35/20

M = 10/20 + 35/20

M = 45/20

M = 9 * 5/4 * 5

M = 9/4

N = 4/7 + 15/7 : 5/2

N = 4/7 + 15/7 * 2/5

N = 4/7 + 30/35

N = 20/35 + 30/35

N = 50/35

N = 5 * 10/5 * 7

N = 10/7

O = 1 - 5/2 * 4/15

O = 1 - 20/30

O = 30/30 - 20/30

O = 10/30

O = 1/3

P = 2/7 + 5/14 * (2/3 + 1/3)

P = 2/7 + 5/14 * 1

P = 2/7 + 5/14

P = 4/14 + 5/14

P = 9/14

Réponse :

Explications étape par étape :

■ A = 23/10 = 2,3

   B = 4/15

   C = - 49

   D = 35/30 = 7/6 .

   E = 16/7

   F = 50/32 = 25/16 .

   G = 26

   H = 15/8 = 1,875

    I = (20/7) x (5/6) = 100/42 = 50/21 .

   J = 1 - (7/12) = 5/12 .

   K = 10/15 = 2/3 .

   L = (15/16) + (7/2) = (15/16) + (56/16) = 71/16 .

   M = (1/2) + (7/4) = 9/4 .

   N = 10/7

remarque :

si Tu es convenable en calcul mental,

la calculatrice n' est pas indispensable !

   O = 1 - (2/3) = 1/3 .    

   P = 9/14