hirondelle52 Bonjour, A= 3+ 6/15 -3/5 = 45/15+6/15 - 9/15 = 42/15 = 14/5 B= 3/2* -15/3 = -45/6 = -15/3 = -5 C= 4 - 48/168 = 672/168 -48/168 = 624/168 = 156 /42 = 78/21 = 26/ 14 =13/7 D= (3/15 - 10/15) / ( -7/3) = -7/15 * -3/7 = 21/ 105 = 3/ 15 E= 3+1/3 = 9/3 + 1/3 = 10/3 =3/4 + 1/3 = 9/12 + 4/12 = 13/12 =-> 10/3 * 12/13 =120/ 360 = 12/36 = 3/9 = 1/3 F= 2/3 -1/4 = 8/12 -3/12 = 5/12 2/3 +1/4 = 8/12 + 3/12  = 11/12 ->  5/12 * 12/11 = 5/11J'espere avoirs repondue a ta question bon week-end !!:)