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bonjour 9 X 19 = 171 ( 1+ 7 + 1 = 9 ) 171 = 19 + 133 + 19 = 1+9+1+3+3+1+9 = 27 / 3fois = 9 72 = 8 X 9 7+2 = 9 7X 19 = 133 2 X19= 38 133 + 38 = 171 1+3+3+3+8 = 18 1+8 = 9 72 / 12 = 6 ( 1+2+6 = 9 ) = 19 + 38 + 114 = 171 donc 1+9+3+8+1+1+4 = 27 merci