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Sagot :

Réponse :

49) calculer les expressions suivantes

A = 7/3 - 4/3 + 8/5

   = 35/15 - 20/15 + 24/15

   = 59/15 - 20/15

   = 39/15

   = 13/5

B = - 4/9 x 1/5  ÷ 3/7 = - 4/45/3/7 = - 28/135

C = - 8/3 + - 5/6 + 7/4

   = - 32/12 - 10/12 + 21/12

   = - 42/12 + 21/12

   = - 21/12

   = - 7/4

50 calculer les expressions suivantes

L = - 7/5  ÷ (2/9 - 7/18)

  = - 7/5 ÷ (4/18 - 7/18)

  = - 7/5 ÷ (- 3/18)

  = 42/5

M = (4/5 + - 3/2) ÷ (- 9/4 - 1/6)

   = (8/10 - 15/10) ÷ (- 27/12 - 2/12)

    = - 7/10 ÷ (- 29/12)

    = 42/145

Explications étape par étape :

INEQUATION

Bonsoir,

Calculer:

A= 7/3 - (4/3)(5/8)= 7/3-(1/3)(5/2)= 7/3-5/6= (7x2-5)/6= (14-5)/6= 9/6= 3/2

B= (-4/9)(1/5)(7/3)= -28/135

C= (-8x4-5x2+7x3)/12= (-32-10+21)/12= -21/12= -7/4

L= ( - 7/5)+(2/9-7/18)= (- 7/5)+(2x2-7)/18)= - 7/5+(-3/18)= -7/5-1/6

   =(-7x6-1x5)/(5x6)= (-42-5)/30= -47/30

M = (4/5-3/2)/(- 9/4- 1/6)= ((4x2-3x5)/10) /(-9x3-1x2)/12=(-7/10)/(-29/12)

   =  42/145

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