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W 3) jest błąd. Powinno być 1 2/5 * 12 1/7 - 3 1/3 * (4 2/11) - 3 1/2= 7/5*85/7 - 3 1/3 *(4 4/22 - 3 11/22)= 17 - 10/3*15/22= 17- 2 3/11=14 8/11
[2/3 *1/8+ 9/2] / [7/9 - 7/20] =
[2/24+9/2] / [140/180 - 63/180] =
[1/12+54/12] / [77/180] =
55/12 : 77/180 =
55/12 * 180/77 (skracamy 180 i 12 przez 12) 55 * 15/77 = 825/77 = 10 i 55/77 = 10 i 5/7
(5/6+1 i 1/2) : (5/7 - 1 i 2/5) =
(5/6+3/2) : (5/7 - 7/5) =
(5/6 + 9/6) : (25/35 - 49/35) =
(14/6) : (-24/35) =
(14/6) * (-35/24) [skracamy 14 i 24 przez 2] (7/6) * (-35/12) = -245 / 72 = -3 i 29/72
1 i 2/5 * 12 i 1/7 - 3 i 1/3 * (4 i 2/11 - 3 i 1/2) =
7/5 * 85/7 - 10/3 * (46/11 - 7/2) [skracamy siódemki oraz 5 i 85 przez 5] =
17 - 10/3 * (92/22 - 77/22) =
17 - 10/3 * 15/22 [skracamy 15 i 3 przez 3 oraz 10 i 22 przez 2] =
17 - 5 * 5/11 =
17 - 25/11 =
17 - 2 i 3/11 = 14 i 8/11