Let $ a,\ b$ be the real numbers such that $ 0\leq a\leq b\leq 1$. Find the minimum value of $ \int_0^1 |(x\minus{}a)(x\minus{}b)|\ dx$.
1. We start with the integral \(\int_0^1 |(x-a)(x-b)| \, dx\). Given that \(0 \leq a \leq b \leq 1\), we need to consider the behavior of \((x-a)(x-b)\) over the interval \([0, 1]\).

2. The expression \((x-a)(x-b)\) changes sign at \(x = a\) and \(x = b\). Therefore, we split the integral into three parts:
   \[
   \int_0^1 |(x-a)(x-b)| \, dx = \int_0^a (a-x)(b-x) \, dx + \int_a^b (x-a)(b-x) \, dx + \int_b^1 (x-a)(x-b) \, dx
   \]

3. We compute each integral separately:
   - For \(0 \leq x \leq a\):
     \[
     \int_0^a (a-x)(b-x) \, dx = \int_0^a (ab - (a+b)x + x^2) \, dx
     \]
     \[
     = ab \int_0^a 1 \, dx - (a+b) \int_0^a x \, dx + \int_0^a x^2 \, dx
     \]
     \[
     = ab \cdot a - (a+b) \cdot \frac{a^2}{2} + \frac{a^3}{3}
     \]
     \[
     = aba - \frac{(a+b)a^2}{2} + \frac{a^3}{3}
     \]
     \[
     = a^2b - \frac{a^3}{2} - \frac{a^2b}{2} + \frac{a^3}{3}
     \]
     \[
     = \frac{a^2b}{2} - \frac{a^3}{6}
     \]

   - For \(a \leq x \leq b\):
     \[
     \int_a^b (x-a)(b-x) \, dx = \int_a^b (bx - x^2 - ab + ax) \, dx
     \]
     \[
     = \int_a^b (bx + ax - x^2 - ab) \, dx
     \]
     \[
     = (a+b) \int_a^b x \, dx - \int_a^b x^2 \, dx - ab \int_a^b 1 \, dx
     \]
     \[
     = (a+b) \cdot \frac{b^2 - a^2}{2} - \frac{b^3 - a^3}{3} - ab(b-a)
     \]
     \[
     = \frac{(a+b)(b^2 - a^2)}{2} - \frac{b^3 - a^3}{3} - ab(b-a)
     \]
     \[
     = \frac{(a+b)(b-a)(b+a)}{2} - \frac{(b-a)(b^2 + ab + a^2)}{3} - ab(b-a)
     \]
     \[
     = \frac{(b-a)(b^2 - a^2)}{2} - \frac{(b-a)(b^2 + ab + a^2)}{3} - ab(b-a)
     \]
     \[
     = (b-a) \left( \frac{b^2 - a^2}{2} - \frac{b^2 + ab + a^2}{3} - ab \right)
     \]
     \[
     = (b-a) \left( \frac{3(b^2 - a^2) - 2(b^2 + ab + a^2)}{6} - ab \right)
     \]
     \[
     = (b-a) \left( \frac{3b^2 - 3a^2 - 2b^2 - 2ab - 2a^2}{6} - ab \right)
     \]
     \[
     = (b-a) \left( \frac{b^2 - 5a^2 - 2ab}{6} - ab \right)
     \]
     \[
     = (b-a) \left( \frac{b^2 - 5a^2 - 8ab}{6} \right)
     \]

   - For \(b \leq x \leq 1\):
     \[
     \int_b^1 (x-a)(x-b) \, dx = \int_b^1 (x^2 - (a+b)x + ab) \, dx
     \]
     \[
     = \int_b^1 x^2 \, dx - (a+b) \int_b^1 x \, dx + ab \int_b^1 1 \, dx
     \]
     \[
     = \frac{1^3 - b^3}{3} - (a+b) \cdot \frac{1^2 - b^2}{2} + ab(1-b)
     \]
     \[
     = \frac{1 - b^3}{3} - (a+b) \cdot \frac{1 - b^2}{2} + ab(1-b)
     \]
     \[
     = \frac{1 - b^3}{3} - \frac{(a+b)(1 - b^2)}{2} + ab(1-b)
     \]
     \[
     = \frac{1 - b^3}{3} - \frac{a+b - ab^2 - b^3}{2} + ab - ab^2
     \]
     \[
     = \frac{1 - b^3}{3} - \frac{a + b - ab^2 - b^3}{2} + ab - ab^2
     \]
     \[
     = \frac{1 - b^3}{3} - \frac{a + b - ab^2 - b^3}{2} + ab - ab^2
     \]

4. Summing up all the integrals, we get:
   \[
   \int_0^1 |(x-a)(x-b)| \, dx = \frac{a^2b}{2} - \frac{a^3}{6} + (b-a) \left( \frac{b^2 - 5a^2 - 8ab}{6} \right) + \frac{1 - b^3}{3} - \frac{a + b - ab^2 - b^3}{2} + ab - ab^2
   \]

5. To find the minimum value, we need to evaluate the function at the boundaries and critical points. We find that the minimum value occurs when \(a = b = \frac{1}{2}\):
   \[
   \int_0^1 |(x-\frac{1}{2})(x-\frac{1}{2})| \, dx = \int_0^1 (x-\frac{1}{2})^2 \, dx
   \]
   \[
   = \int_0^1 (x^2 - x + \frac{1}{4}) \, dx
   \]
   \[
   = \left[ \frac{x^3}{3} - \frac{x^2}{2} + \frac{x}{4} \right]_0^1
   \]
   \[
   = \left( \frac{1}{3} - \frac{1}{2} + \frac{1}{4} \right) - \left( 0 - 0 + 0 \right)
   \]
   \[
   = \frac{1}{3} - \frac{2}{4} + \frac{1}{4}
   \]
   \[
   = \frac{1}{3} - \frac{1}{4}
   \]
   \[
   = \frac{4 - 3}{12}
   \]
   \[
   = \frac{1}{12}
   \]

The final answer is \(\boxed{\frac{1}{12}}\).