2/5 :(3/5x-1/5)-1/5=1/20
2/5 ÷ (3x/5 - 1/5) - 1/5 = 1/20
2/5 ÷ (3x - 1)/5 - 1/5 = 1/20
2/5 × 5/(3x - 1) = 1/5 + 1/20
2/(3x - 1) = 1/4
3x- 1 = 2 × 4
3x - 1 = 8
3x = 8 + 1
3x = 9
x = 9/3
x = 3
Ответ: x = 3.
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2/5 ÷ (3x/5 - 1/5) - 1/5 = 1/20
2/5 ÷ (3x - 1)/5 - 1/5 = 1/20
2/5 × 5/(3x - 1) = 1/5 + 1/20
2/(3x - 1) = 1/4
3x- 1 = 2 × 4
3x - 1 = 8
3x = 8 + 1
3x = 9
x = 9/3
x = 3
Ответ: x = 3.