Vrai: 2+3 = 3+2, 3+4 =7, 9= 8+1, 4+4 = 7+1, 5=5, 8= 5+3, Faux: 6= 3+5, 5+2 = 3+3, 0= 8+0, 8= 5+2, 7+1=7,

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