(3x+1)^5
=(3x)^5+5(3x)^4+10(3x)^3+10(3x)^2+5(3x)+1
=243x^5+405x^4+270x^3+90x^2+15x+1
=ax^5+bx^4+cx^3+dx^2+ex+f
对应同次项的系数是相等的,也就是
a=243,b=405,c=270,d=90,e=15,f=1
a-b+c-d+e-f=32
(3x+1)^5
=(3x)^5+5(3x)^4+10(3x)^3+10(3x)^2+5(3x)+1
=243x^5+405x^4+270x^3+90x^2+15x+1
=ax^5+bx^4+cx^3+dx^2+ex+f
对应同次项的系数是相等的,也就是
a=243,b=405,c=270,d=90,e=15,f=1
a-b+c-d+e-f=32