已知(3x+1)=ax5+bx4+cx3+dx2+ex+f,则a-b+c-d+e-f的值

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已知(3x+1)=ax5+bx4+cx3+dx2+ex+f,则a-b+c-d+e-f的值

已知(3x+1)=ax5+bx4+cx3+dx2+ex+f,则a-b+c-d+e-f的值
已知(3x+1)=ax5+bx4+cx3+dx2+ex+f,则a-b+c-d+e-f的值

已知(3x+1)=ax5+bx4+cx3+dx2+ex+f,则a-b+c-d+e-f的值
把x=-1代入(3x+1)=ax5+bx4+cx3+dx2+ex+f,得(-3+1)^5=-(a-b+c-d+e-f)则a-b+c-d+e-f=32