题目内容
函数y=
+1(x≥1)的反函数是( )
x-1 |
A.y=(x-1)2+1(x∈R) | B.y=(x-1)2+1(x≥1) | ||
C.y=(x-1)2+1(x≥0) | D.y=
|
由题意x-1=(y-1)2,即y=1+(x-1)2,
又x≥1,得
+1≥1
函数y=
+1(x≥1)的反函数是y=(x-1)2+1(x≥1)
故答案为y=(x-1)2+1(x≥1)
又x≥1,得
x-1? |
函数y=
x-1 |
故答案为y=(x-1)2+1(x≥1)
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