Cho bieu thuc A=\(\left(\dfrac{4}{x-\sqrt{x}}+\dfrac{\sqrt{x}}{\sqrt{x}-1}\right)\div\dfrac{1}{\sqrt{x}-1}\)
a/ Tim dieu kien cua x de bieu thuc A co gia tri xac dinh
b/ Rut gon A
c/ Tinh gia tri cua A khi x = \(4-2\sqrt{3}\)
d/ Tim gia tri nho nhat cua A
1. A. out B. round C. about D. would
2. A. too B. soon C. good D. food
3. A. though B. enough C. cough D. rough
4. A. happy B. hour C. high D. hotel
5. A. equal B. fashion C. champagne D. match
6. A. only B. cotton C. cross D. economic
7. A. baggy B. minority C. style D. symbol
8. A. design B. ghost C. clothing D. strong
9. A. casual B. sale C. sleeveless D. slit
10. A. baggy B. fashion C. label D. casual
11. A. economy B. occasion C. freedom D. logical
12. A. encourage B. young C. proud D. enough
13. A. rivarly B. economic C. symbolic D. comic
14. A. champagne B. check C. cheese D. choose