若y=根号1-x+根号x-1+2x,求2x+y的算术平方根
人气：217 ℃ 时间：2019-10-24 07:24:03
解答
根号则x-1>=0,x>=1
1-x>=0,x<=1
同时成立
所以x=1
所以y=0+0+2=2
2x+y=4
所以2x+y的算术平方根=2
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