Pouvez vous m'aider je n'ai rien compris Merci beaucoup Calculer A = 2a+1/a +a/2a+1 Lorsque a = 2/3 Calculer B = ( 3a+2 ) x (

Bonjour,

Calculer A = 2a+1/a +a/2a+1 Lorsque a = 2/3

A = 2a + 1/a + a/2a + 1

A = 2 * 2/3 + 1 : 2/3 + 2/3 : (2 * 2/3) + 1

A = 4/3 + 1 x 3/2 + 2/3 : 4/3 + 1

A = 4/3 + 3/2 + 2/3 x 3/4 + 1

A = 4/3 + 2/3 + 6/12 + 1

A = 4/3 + 2/3 + 1/2 + 1

A = 8/6 + 4/6 + 3/6 + 6/6

A = 21/6

A = 7/2

A = 3,5.

Calculer B = ( 3a+2 ) x ( 5-2 ) Lorsque a = -5

B = (3a + 2) x (5 - 2)

B = (3 * - 5 + 2) x (5 - 2)

B = (- 15 + 2) x 3

B = - 13 x 3

B = - 39.

Calculer C = 4a-3 x 3a+5/2-a Lorsque a = -2

C = 4a - 3 x 3a + 5/2 - a

C = 4 * - 2 - 3 * 3 * - 2 + 5/2 - (- 2)

C = - 8 - 9 * - 2 + 5/2 + 2

C = - 8 + 18 + 5/2 + 2

C = 12 + 5/2

C = 14,5.

Calculer D = 3a+2x5-2a Lorsque a = -1/4

D = 3a + 2 * 5 - 2a

D = 3 * - 1/4 + 10 - 2 * - 1/4

D = - 3/4 + 10 + 2/4

D = - 1/4 + 10

D = - 1/4 + 40/4

D = 39/4

D = 12,25.

Réponse :

Je suppose que le À = (2a + 1)/a + a/(2a + 1) ????

Il faudra penser à mettre des parenthèses on ne comprends rien à tes calculs !!!!

Explications étape par étape

Bonjour

Calculer A = 2a+1/a +a/2a+1 Lorsque a = 2/3

A = [2 x 2/3 + 1]/(2/3) + (2/3)/[2 x 2/3 + 1]

A = (4/3 + 3/3) x 3/2 + (2/3)/(4/3 + 3/3)

A = 7/3 x 3/2 + (2/3)/(7/3)

A = 3/3 x 7/2 + 2/3 x 3/7

A = 7/2 + 2/7

A = 49/14 + 4/14

A = 53/14

Calculer B = ( 3a+2 ) x ( 5-2 ) Lorsque a = -5

B = (3 x (-5) + 2) x 3

B = (-15 + 2) x 3

B = -13 x 3

B = -39

Calculer C = 4a-3 x 3a+5/2-a Lorsque a = -2

C = 4 x (-2) - 3 x 3 x (-2) + 5/2 - (-2)

C = -8 + 18 + 5/2 + 2

C = 12 + 5/2

C = 24/2 + 5/2

C = 29/2

Calculer D = 3a+2x5-2a Lorsque a = -1/4

D = 3 x (-1/4) + 10 - 2 x (-1/4)

D = -3/4 + 40/4 + 2/4

D = 39/4