Mathématiques
corinneserpagi
8

bonjour pouvez vous m'aider svp a cet exercice de math merci bcp :effectue les calculs suivants mettre au même dénominateur si besoin: 9/11-4/121 ; 5/12+19/36 ; 9-15/2-3/2 ;1-5:16+3:8 ; 7/8+2/6+5/9 ; 11/7+9/14+3/28 ; (2/10+1/30)-(1/5-1/15) ; (7/6+7/4)-7/12

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caroline974181

Bonjour, 9/11-4/121 = 9 x 11 / 11 x 11 - 4/121 = 99/121 - 4/121 = 95/121 = 5/12+19/36 = 5 x 3 / 12 x 3 + 19/36 = 15/36 + 19/36 = 34/36 = 2 x 17 / 2 x 18 = 17/18 9-15/2-3/2 = 9 x 2 / 1 x 2 - 15/2 - 3/2 = 18/2 - 15/2 - 3/2 = 18/2 - 18/2 = 0 1-5/16+3/8 = 1 x 16 / 1 x 16 - 5/16 + 3 x 2 / 8 x 2 = 16/16 - 5/16 + 6/16 = 22/16 - 5/16 = 17/16 7/8+2/6+5/9 = 7 x 9 / 8 x 9 + 2 x 12 / 6 x 12 + 5 x 8 / 9 x 8 = 63/72 + 24/72 + 40/72 = 127/72 11/7+9/14+3/28 = 11 x 4 / 7 x 4 + 9 x 2 / 14 x 2 + 3/28 = 44/28 + 18/18 + 3/28 = 65/28 (2/10+1/30)-(1/5-1/15) = (2 x 3 / 10 x 3 + 1/30) - (1 x 6 / 5 x 6 - 1 x 2 / 15 x 2) = (6/30 + 1/30) - (6/30 - 2/30) = 7/30 - 4/30 = 3/30 = 3 x 1 / 3 x 10 = 1/30 (7/6+7/4)-7/12 = (7 x 2 / 6 x 2 + 7 x 4 / 3 x 4) - 7/12 = (14/12 - 28/12) - 7/12 = - 14/12 - 7/12 = - 21/12 = 3 x - 7 / 3 x 4 = - 7/4

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