Bonjour, EFFECTUER LES CALCULS SUIVANTS ET DONNER LA REPONSE SOUS LA FORME D UNE FRACTION IRREDUCTIBLE EN DETAILLANT LES ETAPES DE CALCULS   A= 7/10 - 2/5x 15/7

bonjour

A = 7/10 - 2 /5 x 15/7

A = 7/10 - 30/ 35

A   =  49/70 - 60/70 = - 11/70

B = ( 1 + 5/3) : ( - 7/9)

B = ( 3/3 + 5/3) : - 7/9

B = 8/3 x  - 9/7

B = - 72/21  = - 24/ 7

C = 2 - 3/4 x 8/21

C = 2 - 24/84

C = 168/84 - 24/84

C = 144//84   = 12 / 7

D = ( 1 - 2/3) : ( 1 + 2/3)

  = ( 3/3 - 2/3 ) : ( 3/3 + 2/3)

  = 1/3 x 3/5 = 3 /15 = 1/5

Bonjour,

A= 7/10 - 2/5x 15/7

A= 7/10- 2 x 3/7   une simplification

A= 7/10 - 6/7

A= (7*7-6*10)/ (10*7)

A= -11/ 70

B = (1+ 5/3): (-7/9)

B= (1*3+5)/3 : (-7/9)

B= 8/3 x (-9/7)

B= 8 x (-3/7)

B= -24/7

C= 2 -3/4x8/21  une simplification

C= 2-1 x 2/7

C= (2*7-2)/7

C= 12/ 7

D= (1-2/3):(1+2/3)

D= (1*3-2)/3 : (1*3+2)3

D= 1/3 : 5/3

D= 1/3 x 3/5= 3/15

D= 1/5