理科附加题:已知(1+12x)n展开式的各项依次记为a1(x),a2(x),a3
题型:解答题
问题:
理科附加题: 已知(1+
设F(x)=a1(x)+2a2(x)+3a3(x),…+nan(x)+(n+1)an+1(x). (Ⅰ)若a1(x),a2(x),a3(x)的系数依次成等差数列,求n的值; (Ⅱ)求证:对任意x1,x2∈[0,2],恒有|F(x1)-F(x2)|≤2n-1(n+2). |
理科附加题: 已知(1+
设F(x)=a1(x)+2a2(x)+3a3(x),…+nan(x)+(n+1)an+1(x). (Ⅰ)若a1(x),a2(x),a3(x)的系数依次成等差数列,求n的值; (Ⅱ)求证:对任意x1,x2∈[0,2],恒有|F(x1)-F(x2)|≤2n-1(n+2). |