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先化简再求值(1-1/x+1)除以x/x-1其中x=2
题目详情
先化简再求值 (1-1/x+1)除以x/x-1 其中x=2
▼优质解答
答案和解析
(1-1/x+1)除以x/x-1
=(x+1-1)/(x+1)*(x-1)/x
=x/(x+1)*(x-1)/x
=(x-1)/(x+1)
=(2-1)/(2+1)
=1/3
=(x+1-1)/(x+1)*(x-1)/x
=x/(x+1)*(x-1)/x
=(x-1)/(x+1)
=(2-1)/(2+1)
=1/3
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