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duonganhkhoi18219
2 năm trước
7. Số nguyên dương n được gọi là số điều hoà nếu như tổng các bình phương của các ước dương của nó (kể cả 1 và n) đúng bằng bình phương của số (n+3).Trong các số sau, số nào là số điều hoà? A.286 B. 287 C. 288 D. 289 E. 290
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chia động từ trong ngoặc cho đúng thì: 25. Ba's teacher (give) __________ him a lot of homework last week. 26. Tom hopes he (meet) __________ many interesting people when he goes to Hanoi next month. 27. Mai and her friends (walk) ____________________ to school now. 28. They (go) __________ to Sao Mai Movie Theater last night. 29. She (not see) ____________________ that film before. 30. My mother was waiting for me when I (come) ______________ home. 31. Ann and Susan (cook) _____________________ dinner when Martin arrived home. 32. The light (go) ______________ out while we were having dinner. 33. + What __________ you (do) ______________ at this time yesterday? + I (play) _____________________ games on the computer. 34. Tom! Turn off the TV. You (always watch) ____________________ TV. 35. Lan often (do) __________ her homework carefully. 36. This is the first time Hoa (meet) ____________________ Tim's family.

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