Mỗi số trong 100 số đã cho được thêm 1. Sau đó, mỗi số được cộng thêm 1 lần nữa. Biết rằng ở lần đầu tiên, tổng các bình phương của các số là không đổi. Hỏi tổng này thay đổi như thế nào ở lần thứ hai. Ai biết thì giải chi tiết giúp mình với nhé! Mình xin cảm ơn!!!

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Ex 1: Choose a suitable option A, B, C or D 1. Oil, coal and natural gas are …… A. solar system B. nuclear power C. hydropower D. fossil fuels 2. …… source of energy is the source that can’t be replaced after use. A. Renewable B. Natural C. Effective D. Non-renewable 3. …… energy is one that comes from sun. A. Nuclear B. Wind C. Wave D. Solar 4. He is a teacher, ......? A. is he B. doesn’t he C. wasn’t he D. isn’t he 5. Low energy light bulbs should be used to …… electricity. A. spend B. buy C. convert D. save 6. All the houses in our village will be …… by solar energy. A. heated B. heightened C. frozen D. widened 7. You just wear …… on your back and fly. A. glasses B. screws C. jet pack D. sparkles 8. I …… for you at this time next week. A. will waiting B. will be waiting C. will be waited D. will wait 9. I hope the weather …… fine tonight. A. will been B. will to be C. will be D. will being 10. You can see a jet pack to …… anywhere easily. A. drive B. sail C. ride D. fly 11. Susan and Mike came to work …… bus yesterday. A. at B. on C. in D. by 12. Which …… of transport do you think will be used in the future? A. mean B. means C. meaning D. meanings 13. If you want to watch fish swimming around you when you are travelling, take a(n) …… A. airplane B. driverless car C. flying car D. underwater train 14. He enjoys …… a horse when he has free time. A. riding B. flying C. pedaling D. driving 15. This isn’t your chairs. It’s …… A. my B. me C. I D. mine 16. My mother and I often come to school …… foot. A. at B. in C. on D. by