Find the least positive integer, which may not be represented as ${2^a-2^b\over 2^c-2^d}$, where $a,\,b,\,c,\,d$ are positive integers.
1. We start by considering the expression \(\frac{2^a - 2^b}{2^c - 2^d}\) where \(a, b, c, d\) are positive integers.
2. If \(b = d\), we can simplify the expression as follows:
   \[
   \frac{2^a - 2^b}{2^c - 2^d} = \frac{2^a - 2^b}{2^c - 2^b} = \frac{2^b(2^{a-b} - 1)}{2^b(2^{c-b} - 1)} = \frac{2^{a-b} - 1}{2^{c-b} - 1}
   \]
3. For the fraction \(\frac{2^{a-b} - 1}{2^{c-b} - 1}\) to be an integer, \(2^{a-b} - 1\) must be divisible by \(2^{c-b} - 1\). This implies:
   \[
   2^{a-b} \equiv 1 \pmod{2^{c-b} - 1}
   \]
4. By properties of modular arithmetic, this means that the order of 2 modulo \(2^{c-b} - 1\) must divide \(a-b\). The order of 2 modulo \(2^{c-b} - 1\) is precisely \(c-b\). Hence, \(c-b\) must divide \(a-b\).
5. If \(c-b\) divides \(a-b\), then \(\frac{2^{a-b} - 1}{2^{c-b} - 1}\) is an odd number.
6. Now, consider the case where \(b > d\) and \(c-d = a-b\). We get:
   \[
   \frac{2^a - 2^b}{2^c - 2^d} = \frac{2^b(2^{a-b} - 1)}{2^d(2^{c-d} - 1)} = 2^{b-d} \cdot \frac{2^{a-b} - 1}{2^{c-d} - 1} = 2^{b-d}
   \]
   Hence, all powers of 2 can be represented.
7. Furthermore, any number of the form \(2^m \cdot N\) where \(m \in \mathbb{N}\) and \(N\) is of the form \(\frac{2^{a-b} - 1}{2^{c-d} - 1}\) can also be represented.
8. We now check by hand that all numbers from 1 to 10 can be represented using the given form.
9. Next, we check for 11. Since 11 is odd, it can only be represented in the form \(\frac{2^{a-b} - 1}{2^{c-d} - 1}\). For this to be true, 11 must divide \(2^{a-b} - 1\).
10. By Fermat's Little Theorem (FLT), \(a-b\) must be a multiple of 10 because \(2^{10} \equiv 1 \pmod{11}\). However, this cannot happen since 10 does not divide \(a-b\), leading to a contradiction.
11. Therefore, we conclude that the smallest positive integer that cannot be represented in the given form is 11.

The final answer is \(\boxed{11}\).