If the roots of the quadratic equation $ax^{2} + bx + c = 0$ are $\dfrac {k + 1}{k}$ and $\dfrac {k + 2}{k + 1}$, then $\left (\dfrac {a}{a + b + c}\right )^{2}$ equals.
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If the roots of the quadratic equation $ax^{2} + bx + c = 0$ are $\dfrac {k + 1}{k}$ and $\dfrac {k + 2}{k + 1}$, then $\left (\dfrac {a}{a + b + c}\right )^{2}$ equals.