题目

If the integral expression is $x^{3} + a x^{2} + b x + c$ and a、b、c are constant. When x=1, the value of the integral expression is 1; When x= 2, the value of the integralion is 2；When x=8 and x=-5, the value of the integral expression is M and N respectively, find the value of M-N. ——关联：代数式-整式、📝代数式问题精选 ——退化条件求值应用 ——链接：〚250912-2〛✶✶💯