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coganglucquan
2 năm trước
Chứng minh rằng: $n^{n-1}$ + $n^{n-2}$ + $n^{n-3}$ + ... + $n^{3}$ + $n^{2}$ +n chia hết cho n - 1 với mọi số tự nhiên n > 1 ( Sử dụng đồng dư thức )
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1. …………Tom was lazy and didn’t do his homework, he was punished by his parents. A. Since B. As C. Because D. All are correct 2. Please ………….. off the lights before leaving the room. A. take B. get C. turn D. leave 3. It was raining; ……………., the soccer game was going on. A. and B. but C. however D. therefore 4. I’ve ………my glasses everywhere but I can’t find them anywhere. A. looked for B. looked after C. looked D. looked into 5. This window ........................ by him yesterday. A. are break B. were break C. broken D. was broken 6. Tommy suggested …………….. the lights when we go out. A. to turn off B. turning off C. turn off D. turned off 7. What can we do to spend less ................... lighting? A. in B. on C. about D. of 8. His hobbies are playing soccer ................... collecting stamps. A. and B. but C. however D. although 9. Is he an actor ....................... a singer? - An actor. A. and B. or C. with D. so 10. He was tired, ........................ he took a rest before continuing the work. A. so B. and C. but D. if 11. She feels tired and sleepy …… she stayed up late last night. A.so B. but C. because D. and 12. She stays at home because she has to look ....................... her baby. A. at B. for C. up D. after

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