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y=x(x-1)^2(x+3)^3 設y=ax^6+bx^5+cx^4+dx^3+ex^2+fx+g 則六階導數後,後面全部變為0 所以y''''''=(ax^6)'''''' 由於展開式中,x的6次方的係數是1, 所以:y^(6)=(x^6)'''''' (x^6)'=6x^5 (x^6)''=6*5*x^4 原式=6*5*4*3*2*1=30*6*4=180*4=720
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