先化简(1+1/x-1)÷x/(x-1)(x+1),然后再从不等式1/2(3x+4)+3≤7的解集中选择一个恰当的解代人求值
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![先化简(1+1/x-1)÷x/(x-1)(x+1),然后再从不等式1/2(3x+4)+3≤7的解集中选择一个恰当的解代人求值](/uploads/image/z/14540890-58-0.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%281%2B1%2Fx-1%29%C3%B7x%2F%28x-1%29%28x%2B1%29%2C%E7%84%B6%E5%90%8E%E5%86%8D%E4%BB%8E%E4%B8%8D%E7%AD%89%E5%BC%8F1%2F2%283x%2B4%29%2B3%E2%89%A47%E7%9A%84%E8%A7%A3%E9%9B%86%E4%B8%AD%E9%80%89%E6%8B%A9%E4%B8%80%E4%B8%AA%E6%81%B0%E5%BD%93%E7%9A%84%E8%A7%A3%E4%BB%A3%E4%BA%BA%E6%B1%82%E5%80%BC)
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先化简(1+1/x-1)÷x/(x-1)(x+1),然后再从不等式1/2(3x+4)+3≤7的解集中选择一个恰当的解代人求值
先化简(1+1/x-1)÷x/(x-1)(x+1),然后再从不等式1/2(3x+4)+3≤7的解集中选择一个恰当的解代人求值
先化简(1+1/x-1)÷x/(x-1)(x+1),然后再从不等式1/2(3x+4)+3≤7的解集中选择一个恰当的解代人求值
(1+1/x-1)÷x/(x-1)(x+1),
=[(x-1+1)/(x-1)]/[x/(x-1)(x+1)]
=[x/(x-1)]/[x//(x-1)(x+1)]
=x+1
1/2(3x+4)+3≤7
3x+4+6≤14
3x≤4
x≤4/3
设x=-1
∴原式=1-1=0
x-1/x÷(x-1/x)
x/x+(1-x)/x-1/x
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