Bonjour jai besoin daide pour mon devoir de maths des équations.... Merci beaucoup 1)-3=x+3 2) −3x+1=−5x−9 3) 6x=−36 4) 2=​x​​/3​​ 5) v au carré =25 6) −(−6x−2)−x=3(−6x−3)−2 7) -6x + 2 = -10 8) −18n−8n​ au carre+(6+2n)(4n−1)=0 9) ​2​​/3​​=​x​​/7​​ 10) ​ −6(6+6x)−3x=6(​6​​/3​​−2x) 11) ​6​​/--5 =​6​​/--5 +8x 12) {​7h+3k=62​ {7h+2k=53​ 1 Voir la réponse maudmarine maudmarine Bonsoir, 1)-3=x+3  x + 3 = - 3x = - 3 - 3x = - 62) −3x+1=−5x−9 -3x + 5x = - 9 - 12x = - 10x = - 10/2x = - 53) 6x=−36 x = 36/6x = 64) 2=​x​​/3​​ x/3 = 2x/3 = 6/3x = 65) v² =25 v = √25v = 56) −(−6x−2)−x=3(−6x−3)−2 + 6x + 2 - x = - 18x - 9 - 26x + 18x - x = - 9 - 2 - 223x = - 13x = - 13/237) -6x + 2 = -10 - 6x = - 10 - 2- 6x = - 12x = 12/6x = 28) −18n−8n​²+(6+2n)(4n−1)=0 - 18n - 8n² + 24n - 6 + 8n²- 2n = 0- 8n² + 8n² - 18n - 2n + 24n = 64n = 6n = 6/4n = 3/29) ​2​​/3​​=​x​​/7​​ x/7 = 2/33x/21 = 14/213x = 14x = 14/310) ​ −6(6+6x)−3x=6(​6​​/3​​−2x) - 36 - 36x - 3x = 36/3 - 12x- 36x - 3x + 12x = 12 + 36- 27x = 48x = 48/27x = 16/911) ​6​​/--5 =​6​​/--5 +8x   --> Erreur de signes --12) {​7h+3k=62​ {7h+2k=53​- 14h - 6k = - 12421h + 6k = 1597h = 35h = 35/7h = 57h + 2k = 537 * 5 + 2k = 5335 + 2k = 532k = 53 - 352k = 18k = 18/2k = 9S = (5 ; 9) ex5) v²=25 donc v= + ou- V25 soit +5 ou -5 (2 solutions).
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