y=根号x-4+根号4-x+1,求x:y
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y=根号x-4+根号4-x+1,求x:y
y=根号x-4+根号4-x+1,求x:y
y=根号x-4+根号4-x+1,求x:y
(注:表示根号) a有意义=>a>=0; y=(x-4)+(4-x)+1=>x-4>=0且4-x>=0=>x=4=>y=1=>x:y=4:1
y=根号x-4+根号4-x+1 根据被开方数非负 x-4 ≥0 x≥4 4-x≥0 x≤4 综合得x =4 那么y=1 x :y =4