Bài 2 : An đi 1 vòng quanh sân nhà mình được 70 bước chân, mỗi bước dài 40 cm. Sắp tới, nhà An muốn lát mảnh sân đó bằng gạch men hình vuông cạnh năm mươi cm. Bố bảo An tính cho bố xem lát kín cái sân đó hết bao nhiêu viên gạch chiều dài sân hơn chiều rộng 4 m. An loay hoay chưa biết tính thế nào. Bạn nào giỏi hãy giúp An nhé!

II. Arrange these words into correct order: 1. Mike/offer/ opportunity/ study abroad/ yesterday. 2. Why/you/ not/ consider/ visit/ me? 3. Many species/plants/ animals/ danger/ extinction. 4. If we/ not/protect/ wildlife now/ there/ nothing/left/ future generations. 5. Remember/ call/home/ as soon/you arrive/ your destination. 6. Albert Einstein/ born/ March 14th 1879/ the Germany. 7. Tourists/come/ all over/ world/ want/ visit/ historic buildings/London. 8. 75% earth surface/ covered/ sea /oceans. 9. I look forward/ see you/ tomorrow night. 10. We/used/walk/school/morning/return / afternoon

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A Màng điện sinh hoạt trong gđ có hiệu điện thế bao nhiêu vôn B dụng cụ trong gđ mắc nối tiếp hay song song

giúp mik vs nhé phải lm đầy đủ đó nha lm tắt ko hiểu nổi đâu Thank!

vật sáng là gì? làm và giải thích câu C5 SGK/ Trang 5

31. They (prepare) _______________ the Christmas dinner at the moment. 32. George (work) ________________ at the university so far. 33. She (learn) __________________ German for two years. 34. Look! That man (try) ________________ to open the door of your car. 35. Listen! They (learn) _______________ a new song. 36. David (repair) _____________ the TV set at the moment. He (work) _______________ at it for one hour. 37. I ________________ can't go with you because I (not finish) _________________ my homework yet. 38. John (wash) _______________ his hands now. He just (repair) __________________ the bike. 39. I (work) _______________ at my report since Monday. Now I (write) _______________ the conclusion. 40. The earth (circle) _____________ the sun once every 365 days. 41. How many times ____________ you (see) ____________ him since he went to Edinburgh? 42. Look! The boy (cry) _______________ 43. Mary (lose) ________________ her hat for 2 days. 44. He (not finish) _______________ doing it yet. 45. She (not see) ________________ him since Christmas.

1:Does your father cycle to work? =>.................................... 2:How heavy are you? =>.....................

Tìm $x$. $\left|\dfrac{\dfrac{3}{8}+\dfrac{1}{9}-\dfrac{3}{17}}{\dfrac{9}{8}+\dfrac{1}{3}-\dfrac{9}{17}}+x\right|+\dfrac{2}{3}=\dfrac{7}{9}$.