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2014-09-18T22:07:58+02:00
2/3 +  -5/9 = -12/5
2/3 - 5/9 +12/5 = 0
2*15 /45 - 5*5 /45 + 12*9 /45 = 0
30/45 -25/45 +108/45 = 0
5/45+108/45 = 0
113/45 =0
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2014-09-18T22:08:16+02:00
Salut
2/3 + -5/9 = 2×9+(-5)×3/3×9
               = 18 +(-15)/27
               = 3/27
2/3 + -5/9 = 1/9