f(x)=|x-4|+|x+2|,若f(x)=k無解，則k為？
回答 (3)
2015-09-13 9:07 am
✔ 最佳答案
f(x)=(x-4)^2+(x+2)^2=k 可視為(4,0),(-2,0)之橢圓 無解表不在線上 所以 k<((4-(-2))^2)^(1/2) ==> k<6
2015-09-13 3:24 pm
k<6
2015-09-13 1:29 pm
In Elliptic Paraboloid z=x^2/a^2 + y^2/b^2 ;Treating (4,0), (-2,0) as x and y terms;
Then z=4^2+4=20.as an analysis.
Then z=4^2+4=20.as an analysis.
收錄日期: 2021-05-04 02:09:24
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