Répondre :
1/1+1/2+1/3-1/4+1/5-1/6+1/7-1/8=
1+ 3/6+ 2/6 -1/4 +1/5 -1/6+1/7 -1/8 =
1+ 4/6 -1/4 +1/5 +1/7 -1/8 =
1+ 16/24 - 6/24 - 3/24 + 1/5 + 1/7=
1+ 7/24 + 7/35 +5/35 = 1 + 7/24 + 12/35 = 1 + 245/840 + 288/240 = 1+ 533/840
1+ 3/6+ 2/6 -1/4 +1/5 -1/6+1/7 -1/8 =
1+ 4/6 -1/4 +1/5 +1/7 -1/8 =
1+ 16/24 - 6/24 - 3/24 + 1/5 + 1/7=
1+ 7/24 + 7/35 +5/35 = 1 + 7/24 + 12/35 = 1 + 245/840 + 288/240 = 1+ 533/840