For a natural number \( n \), let \( \alpha_n = 19^n-12^n \). Then, the value of \( \frac{31\alpha_9-\alpha_{10}}{57\alpha_8} \) is ________.
The sum of squares of all the real solutions of the equation \( \log_{(x+1)}(2x^2+5x+3)=4-\log_{(2x+3)}(x^2+2x+1) \) is equal to \( \_\_\_\_\_ \).
The missing value in the following figure is ______________ .