Đáp án + Giải thích các bước giải:
`(x+3)^2-2.(x+3).(x-3)+(x-3)^2`
`=[(x+3)-(x-3)]^2`
`=(x+3-x+3)^2`
`=6^2`
`=36`
`(x+3)^2-2(x+3)(x-3)+(x-3)^2`
Áp dụng hằng đẳng thức: `(A-B)^2=A^2-2AB+B^2`
9. They__ ________ chocolate ice cream? (like) 10. Nga and Lan ____________to school six days a week. (not go) 11. We __________to school from Mondays to Fridays. (go) 12. My sister __________ me to clean my bike. (help) 13. We ____have______ a new classmate, Mai. (have) 14. Our cat ___play_______ football! (play) 15. He helps me with Science, but he ___doesn’t help_______ me with Maths. (not help) 16. I __________ it now. (need) 17. What you__________next week? (do) 18. Daniel__________his work right now. (not enjoy) 19. The class___begins_______at 8 am. (begin)
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Question 1: As she did so, her parents became ............... A. the angriest B. the most angry C. the more angry D. angrier and angrier Question 2: People should eat ............... and do ............. to reduce the risk of heart disease. A. less fat/ more exercise B. less and less fat/ the more exercise C. the less fat/ the more exercise D. fatter/ more exercise Question 3: He spent a year in India and loves spicy food ............... the food is, ............... he likes it. A. The hotter/ the more and more B. The hotter/the more C. The more and more hot/ the more D. The hottest/ the most Question 4: Of course you can come to the party ............... A. The more the merrier B. The more and the merrier C. The more and merrier D. The more and more merrier Question 5: I feel ............... I did yesterday. A. much more tired than B. many more tired than C. as many tired as D. as more tired as Question 6: She is ............... a spectator. A. more an athlete than B. more of an athlete than C. an athlete more than D. an athlete of more than Question 7: His house is ............... mine. A. twice as big as B. as twice big as C. as two times big as D. as big as twice Question 8: ................ live in Ho Chi Minh City than in the whole of the rest of the country. A. As much as people B. More people C. As many as people D. People more Question 9: It gets ............... to understand what the professor has explained. A. the more difficult B. more difficult than C. difficult more and more D. more and more difficult Question 10: You must drive more slowly in built up areas ............... you drive in the city, it is ............... that you will have an accident. A. The faster and faster/ the more B. The faster/ the more probable C. The more and more fast/ the more and more probable D. The more fastly/ the probable Question 11: The party was ............... I had expected. A. more a hundred times funny than B. a hundred times funny more than C. a hundred times funnier than D. a hundred times more funny than Question 12: He finds physics ............... other science subjects. A. far more difficult than B. many more difficult than
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