Odpowiedź:
2/3 x 2,1 + 2 x (3 i 2/5 + 1,4) = 2/3 * 21/10 + 2 * (2,4 + 1,4) = 7/5 + 2 * 3,8 =
= 1 2/5 + 7,6 = 1,4 + 7,6 = 9
(0,4 x 5/3 -- 2/9) : 0,25 = (2/5 * 5/3 - 2/9) : 1/4 = (2/3 - 2/9) * 4 = (6/9 - 2/9) * 4 = 4/9 * 4 = 16/9 = 1 7/9
(1,2 + 1/25) : 0,4 -- (1,75 -- 5/4) x 2/3 = (1 1/5 + 1/25) : 2/5 - (1 3/4 - 5/4) * 2/3 =
= (1 5/25 + 1/25) * 5/2 - (7/4 - 5/4) * 2/3 = 1 6/25 * 5/2 - 2/4 * 2/3 =
= 31/25 * 5/2 - 1/2 * 2/3 = 31/10 - 1/3 = 93/30 - 10/30 = 83/30 = 2 23/30
1/8 : 0,3 -- (1,75 -- 1/12) x 0,25 = 1/8 : 3/10 - (1 3/4 - 1/12) * 1/4 =
= 1/8 * 10/3 - (1 9/12 - 1/12) * 1/4 = 1/4 * 5/3 - 1 8/12 * 1/4 = 5/12 - 20/12 * 1/4 =
= 5/12 - 5/12 = 0
Szczegółowe wyjaśnienie:
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Odpowiedź:
2/3 x 2,1 + 2 x (3 i 2/5 + 1,4) = 2/3 * 21/10 + 2 * (2,4 + 1,4) = 7/5 + 2 * 3,8 =
= 1 2/5 + 7,6 = 1,4 + 7,6 = 9
(0,4 x 5/3 -- 2/9) : 0,25 = (2/5 * 5/3 - 2/9) : 1/4 = (2/3 - 2/9) * 4 = (6/9 - 2/9) * 4 = 4/9 * 4 = 16/9 = 1 7/9
(1,2 + 1/25) : 0,4 -- (1,75 -- 5/4) x 2/3 = (1 1/5 + 1/25) : 2/5 - (1 3/4 - 5/4) * 2/3 =
= (1 5/25 + 1/25) * 5/2 - (7/4 - 5/4) * 2/3 = 1 6/25 * 5/2 - 2/4 * 2/3 =
= 31/25 * 5/2 - 1/2 * 2/3 = 31/10 - 1/3 = 93/30 - 10/30 = 83/30 = 2 23/30
1/8 : 0,3 -- (1,75 -- 1/12) x 0,25 = 1/8 : 3/10 - (1 3/4 - 1/12) * 1/4 =
= 1/8 * 10/3 - (1 9/12 - 1/12) * 1/4 = 1/4 * 5/3 - 1 8/12 * 1/4 = 5/12 - 20/12 * 1/4 =
= 5/12 - 5/12 = 0
Szczegółowe wyjaśnienie: