Bonjour, pouvez vous m'aider: voilà le devoir . Merci d'avance Donnez le résultat sous la forme la plus simple. 1/2+2/3+3/4+4/5+5/6 1/2-1/3+1/4-1/5+1/6 1/2-(1/3+1/4)-(1/5+1/6) (2/3-1/6):(1/8-3/5) 13/4-(7/6-3/4) (3/2-7/5)x(-5/6)-3 (3/4-2/7-2)x21/4 2/3+5/3x12/7-18x7/27 = 1/2 + 2/3 + 3/4 + 4/5 + 5/6 = 3/6 + 4/6 + 3/4 + 4/5 + 5/6 = 7/6 + 3/4 + 4/5 + 5/6 = 12/6 + 3/4 + 4/5 = 48/24 + 18/24 + 4/5 = 66/24 + 4/5 = 11/4 + 4/5 = 55/20 + 16/20 = 71/20 = 1/2 - 1/3 + 1/4 - 1/5 + 1/6 = 3/6 - 2/6 + 1/4 - 1/5 + 1/6 = 1/6 + 1/4 - 1/5 + 1/6 = 2/6 + 1/4 - 1/5 = 8/24 + 6/24 - 1/5 = 14/24 - 1/5 = 23/60 = 1/2 - ( 1/3 + 1/4 ) - ( 1/5 + 1/6 ) = 1/2 - 7/12 - 11/30 = -1/12 - 11/30 = -9/20 = ( 2/3 - 1/6 ) : ( 1/8 - 3/5 ) = 1/2 : (-19/40) = 1/2 x (-40/19) = -20/19 = 13/4 - ( 7/6 - 3/4 ) = 13/4 - 5/12 = 17/6 = ( 3/2 - 7/5 ) x ( -5/6 ) - 3 = 1/10 x ( -5/6 ) - 3 = -1/12 - 3 = -37/12 = ( 3/4 - 2/7 - 2 ) x 21/4 = ( 13/28 - 2 ) x 21/4 = -43/28 x 21/4 = -129/16 = 2/3 + 5/3 x 12/7 - 18 x 7/27 = 2/3 + 20/7 - 14/3 = 74/21 - 14/3 = -8/7
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