một bánh xe trung bình một giây quay được  vòng .Hỏi trong \(7\dfrac{1}{2}\) giây ,bánh xe ấy quay được bao nhiêu vòng ?

cho \(\dfrac{21}{...}\) x 3 = \(2\dfrac{1}{3}\)

Số thích hợp để điền vào chỗ chấm là :

A.28      B.27        C.18           D.9

12. We (think)_____ the food was delicious.
13. Yesterday, I (go)______ to the restaurant with a client.
14. We (drive) ______ around the parking lot for 20 mins to find a parking space.
15. When we (arrive) ______ at the restaurant, the place (be) ______ full.
16. The waitress (ask) ______ us if we (have) ______  reservations.
17. I (say)______, "No, my secretary forgets to make them."
18. The waitress (tell)______ us to come back in two hours.
19. My client and I slowly (walk) ______ back to the car.
20. Then we (see) ______ a small grocery store.
21. We (stop) ______in the grocery store and (buy) ______ some sandwiches.
22. That (be) ______ better than waiting for two hours.
23. I (not go) ______ to school last Sunday.
24. ______She (get) ______ married last year?
25. What ______you (do) ______ last night? - I (do) ______ my homework.
26. I (love) ______ him but no more.
27. Yesterday, I (get) ______ up at 6 and (have) ______ breakfast at 6. 30.
28. They (buy) ................ that house last year.
29. She (not go) ............. to school yesterday.
30. That boy (have) ............... some eggs last Sunday

tìm x ,biết :

( x +\(\dfrac{1}{10}\) )  x\(\dfrac{5}{6}\) = 3-\(\dfrac{7}{6}\)