C = - 4/7 : 5/14 + 5/6 C = - 4/7 x 14/5 + 5/6 C = -56/35 + 5/6 C = - 56 x 6 / 35 x 6 + 5 x 35 / 6 x 35 C = 336/210 + 175/210 C = 511/210 C = 7 x 73 / 7 x 30 C = 73/30
D = - 4/7 : (5/14 + 5/6) D = - 4/7 : (5 x 6 / 14 x 6 + 5 x 14 / 6 x 14) D = - 4/7 : (30/84 + 70/84) D = - 4/7 : (100/84) D = - 4/7 x 84/100 D = - 336/700 D = 28 x - 12 / 28 x 25 D = - 12/25
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Ce que tu as noté au début ne correspond à rienC = - 4/7 : 5/14 + 5/6
C = - 4/7 x 14/5 + 5/6
C = -56/35 + 5/6
C = - 56 x 6 / 35 x 6 + 5 x 35 / 6 x 35
C = 336/210 + 175/210
C = 511/210
C = 7 x 73 / 7 x 30
C = 73/30
D = - 4/7 : (5/14 + 5/6)
D = - 4/7 : (5 x 6 / 14 x 6 + 5 x 14 / 6 x 14)
D = - 4/7 : (30/84 + 70/84)
D = - 4/7 : (100/84)
D = - 4/7 x 84/100
D = - 336/700
D = 28 x - 12 / 28 x 25
D = - 12/25