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x/xx+x+1=1/4求xx/xxxx+xx+1
题目详情
x/xx+x+1=1/4 求xx/xxxx+xx+1
▼优质解答
答案和解析
xx/(xxxx+xx+1)
=1/(xx+1+1/xx)
x/xx+x+1=1/4
4x=xx+x+1
3x=xx+1
xx=3x-1
所以原式化简为:
原式
=1/(xx+1+1/xx)
=1/(3x-1+1+1/(3x-1))
=1/(3x+1/(3x-1))
=(3x-1)/(9xx-3x+1)
=(3x-1)/(9(3x-1)-3x+1)
=(3x-1)/(27x-9-3x+1)
=(3x-1)/(24x-8)
=(3x-1)/[8(3x-1)]
=1/8.
=1/(xx+1+1/xx)
x/xx+x+1=1/4
4x=xx+x+1
3x=xx+1
xx=3x-1
所以原式化简为:
原式
=1/(xx+1+1/xx)
=1/(3x-1+1+1/(3x-1))
=1/(3x+1/(3x-1))
=(3x-1)/(9xx-3x+1)
=(3x-1)/(9(3x-1)-3x+1)
=(3x-1)/(27x-9-3x+1)
=(3x-1)/(24x-8)
=(3x-1)/[8(3x-1)]
=1/8.
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