1) 23:(x-1/3) = 423 = 4 (x-1/3)23 = 4x - 4/323 + 4/3 = 4x(69/3 + 4/3) = 4x73/3 = 4x73/3 1/4 = xx = 73/12
2/5k + 1/5k = 33/5k = 3k = (3 * 5)/3k = 5
2) 9/10x = 6/25x = (6/25) * (10/9)x = 60/225x = 4/15
1) 2/3 - x = 2/3 - 4/15 = 10/15 - 4/15 = 6/15 = 2/5
2) 3 - x + 1/20 = 3 - 4/15 + 1/20 = 45/15 - 4/15 + 3/60 = (45 - 4 + 3)/15 = 44/15
Ответ: 1) 2/5; 2) 44/15.
1) 23:(x-1/3) = 4
23 = 4 (x-1/3)
23 = 4x - 4/3
23 + 4/3 = 4x
(69/3 + 4/3) = 4x
73/3 = 4x
73/3 1/4 = x
x = 73/12
2/5k + 1/5k = 3
3/5k = 3
k = (3 * 5)/3
k = 5
2) 9/10x = 6/25
x = (6/25) * (10/9)
x = 60/225
x = 4/15
1) 2/3 - x = 2/3 - 4/15 = 10/15 - 4/15 = 6/15 = 2/5
2) 3 - x + 1/20 = 3 - 4/15 + 1/20 = 45/15 - 4/15 + 3/60 = (45 - 4 + 3)/15 = 44/15
Ответ: 1) 2/5; 2) 44/15.