Bonjour pourriez vous m'aider pour l'exercice de math

Réponse :

Explications étape par étape

Bonjour,

Exercice 2

A=

10/15 +21/15 + 40/15 + 39/15 + 45/15= 156/15 = 52/3

B=

(32*27*21)/ ( 15*56*36) = 18 144/ 30 240 = 3024/5040 = 336/560 = 168/280= 84/140= 42/70= 21/35= 3/5

C=

55/132 = 5/12

35/90= 7/18

66/36 = 33/18

5/12 + 7/18 + 33/18 =

5/12 + 40/18=

5/12 + 20/9=

15 /36+ 80/36 =  95/36

D=

(7*40*42) / ( 32*49*45) =

en simplifiant

(1*10*14)/(8*7*15)=

140/ 840 = 70/420 = 10/60 = 1/6

bjr

ex 3

A = 3 x 5 + 7 x 8 - (-9 + 3) x 11  

 = 15 + 56 - (-6) x 11

= 71 + 66

= 137

B = (4/15) x 3 - (13/20) x 4 + 2

  = 4/5 - 13/5 + 2  (on simplifie)

  = -9/15 + 30/15

 = 21/15

=7/5

C = (5/3) x (4/9) x (54/70) + 11/4

  = (5 x 4 x 54)/(3 x 9 x 70) + 11/4   (on simplifie)

 = 4/7 + 11/4

= 16/28 + 77/28

= 93/28

D = ( 2 + (4/5)x(10/3)) / (-7/3) + 5/2

   = ( 2 + (8/3) ) / (-7/3) + 5/2

  = ( (6/3) + (8/3) )/(-7/3) + 5/2

  = (14/3)x(-3/7) + 5/2

 =   -2 + (5/2)

  = (-4/2) + 5/2

= 1/2