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- 精华
- 0
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- 257
- 经验
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- 威望
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- 金钱
- 430 ￥
- 魅力
- 257
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GWD3-18
| Q18:
The function f is defined by f(x) = √x – 10 for all positive numbers x. If u = f(t) for some positive numbers t and u. What is t in terms of u?
A. √(u+10)
B. (√u + 10)2
C. √(u2+10)
D. (u + 10)2
E. (u2 + 10)2
答案是D，不明白哎 |
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