Known x1, X2, X3 , xn can only take one of - 2, 0, 1, and satisfy X1 + x2 + +xn=-17,x12+x22+… +Xn2 = 37, find x13 + x23 + +The value of xn3

Known x1, X2, X3 , xn can only take one of - 2, 0, 1, and satisfy X1 + x2 + +xn=-17,x12+x22+… +Xn2 = 37, find x13 + x23 + +The value of xn3

Let p x take 1, Q x take - 2, P − 2q = − 17p + 4q = 37, (5 points) the solution is p = 1q = 9, (5 points), so the original formula = 1 × 13 + 9 × (- 2) 3 = - 71. (3 points)