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Litera P będzie oznaczała: pod kreską ułamkową
Działanie 1.
0,05 - N: (2 i 4/5 - 1,9) : 3 i 3/4 P: [3 i 1/6 - (-1,25)] * 2,4 + (-5,8) =
5/100 - N: (14/5 - 19/10) : 15/4 P: [19/6 + 125/100] * 24/10 - 58/10 =
5/100 - N: (28/10 - 19/10) * 4/15 P: [1900/600 + 750/600] * 24/10 - 58/10 =
5/100 - N: 9/10 * 4/15 P: 2650/600 * 24/10 - 58/10 =
5/100 - N: 6/25 P: 265/60 * 24/10 - 58/10 =
5/100 - N: 6/25 P: 159/15 - 58/10 = 5/100 - N: 6/25 P: 318/30 - 174/30 =
5/100 - N: 6/25 P: 144/30 = 5/100 - 6/25 : 144/30 = 5/100 - 6/25 * 30/144 =
5/100 - 1/20 = 5/100 - 5/100 = 0
Działanie 2.
(2/5 : 2 i 1/2) * (4 i 1/5 - 1 i 3/40) + 1.35 : 2,7 =
(2/5) : 5/2) * (21/5 - 43/40) + 135/100 : 27/10 =
(2/5 * 2/5) * (168/40 - 43/40) + 27/20 : 27/10 =
4/25 * 125/40 + 27/20 * 10/27 = 5/4 + 1/2 = 5/4 + 2/4 = 7/4 = 1 i 3/4
Działanie 3.
N: 1 : 5 P: (83 i 5/18 - 85 i 7/20) : 2 i 2/3 = N:1/5 P: (1499/18 - 1707/20) : 8/3 =
N: 1/5 P: (29980/360 - 30726/360) * 3/8 = N: 1/5 P: (-373/180) * 3/8 =
N: 1/5 P: (-373/480) = 1/5 : (-373/480) = 1/5 * (-480/373) = - 96/373