y=5x-1／4x+2,求值域
<p>问题：y=5x-1／4x+2,求值域<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">宋继平的回答：<div class="content-b">网友采纳 y=(5x-1)／(4x+2) =(5x+5/2-7/2)/(4x+2) =(5x+5/2)/(4x+2)-7/ =5/4-7/(8x+4) 因为7/(8x+4)不等于0, y=5/4-7/(8x+4)不等于5/4 所以 y=（5x-1）／（4x+2）的值域为y不等于5/4
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