化简求值:(2x的n+5次方减去3x的n+4次方减去4x的n+3次方）除以5x的n+3次方,其中x=2
<p>问题：化简求值:(2x的n+5次方减去3x的n+4次方减去4x的n+3次方）除以5x的n+3次方,其中x=2<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">蔡春生的回答：<div class="content-b">网友采纳 〔2x^(n+5)-3x^(n+4)-4x^(n+3)〕/5x^(n+3) =〔2x^2*x^(n+3)-3x*x^(n+3)-4x^(n+3)〕/5x^(n+3) =(2x^2-3x-4)/5 把x=2代入(x+1)(x-4)/5得： (2x^2-3x-4)/5 ＝(2*2^2-3*2-4)/5 =-2/5
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