`\qquad A=\sqrt{x}/(\sqrt{x}-3)`
`|A|>A<=> A<0`
Lại có `\sqrt{x}>=0`
`=> \sqrt{x}-3<0`
`<=> \sqrt{x}<3`
`<=> 0<=x<9`
Do `x` nguyên `=> x∈{0;1;2;3;4;5;6;7;8}`
Vậy `x∈{0;1;2;3;4;5;6;7;8}` thì `|A|>A`
$A=\dfrac{\sqrt{x}}{\sqrt{x}-3}$ ($x\ge 0, x\ne 9$)
$|A|>A\to A<0$
Ta có $\sqrt{x}\ge 0$ nên $A<0$ khi $\begin{cases} x\ne 0\\ \sqrt{x}-3<0\end{cases}$
$\to \begin{cases} x\ne 0\\ x<9\end{cases}$
Đối chiếu ĐK ta có $0<x<9$
Mà $x\in\mathbb{Z}$
Vậy $x\in\{1;2;3;...;8\}$
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3. Since we have to be there by 8.30, we_______ take a taxi. A. had better B. may C. ought D. are able to 4. It _______ rain this evening. Why don't you take an umbrella? A. could be B. must C. might D. had better 5. _______ you help me with the homework? A. May B. Shall C. Should D. Will 6. She hasn't eaten anything since yesterday. She _______ be really hungry. A. might B. will C. must D. can 7. I put my keys on the table, but now it's gone. Someone _______ have taken it. A. may B. had to C. should D. would rather 8. Daisy is reading her English test because she has a test tomorrow. She _______ be studying. A. will B. should C. must D. can 9. We _______ put the fish in the fridge before it spoils. A. had to B. may C. can D. had better 0. Mr. Brown is very rich. He _______ work hard for a living. A. mustn't B. shouldn't C. can't D. doesn't have to 1. Tom has just got a new job. He _______ be very pleased. A. might B. must C. should D. will 2. Tom painted his room black. It looks dark and dreary. He _______ have chosen another color. A. should B. must C. could D. may
Làm từ câu 44=> câu 50 Câu 49: A) hasn't chosen. B) didn't choose C) chose. D) has chosen Câu 50: I_________some food and drink for their new charitable centre yesterday. They_______alot of cheap meals for the poor for two months. A) have provided/ have cooked B) Provided/ have cooked C) provided/ cooked D) have provided/ cooked
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