题目

12.已知,则( 的值等于                           . 答案：-256 解析:(1－x)5=a0+a1x+a2x2+a3x3+a4x4+a5x5.令x=1,则有a0+a1+a2+a3+a4+a5=0,即(a0+a2+a4)+(a1+a3+a5)=0;                                                                                     ①令x=－1,则有a0－a1+a2－a3+a4－a5=25,即(a0+a2+a4)－(a1+a3+a5)=25.                                                                                   ②联立①②有∴(a0+a2+a4)(a1+a3+a5)=－28=－256.

查看本题答案和解析