若(x-2)^5=ax^5+bx^4+cx^3+dx^2+ex+f,求(1)a+b+c+d+e+f(2)a-b+c-d+e-f(3)c+e(4)b+d
问题描述:
若(x-2)^5=ax^5+bx^4+cx^3+dx^2+ex+f,求(1)a+b+c+d+e+f(2)a-b+c-d+e-f(3)c+e(4)b+d
答
(x-2)^5=ax^5+bx^4+cx^3+dx^2+ex+f=x^5-10x^4+40x^3-80x^2+80x-32a=1 b=-10 c=40 d=-80 e=80 f=-32(1)a+b+c+d+e+f=1-10+40-80+80-32=-1(2)a-b+c-d+e-f=1+10+40+80+80+32=243(3)c+e=40+80=120(4)b+d=-10-80=-90