Đáp án + Giải thích các bước giải:
`x(x^{2}+x+1)-x^{2}(x+1)-x+5`
`=x^{3}+x^{2}+x-x^{3}-x^{2}-x+5`
`=(x^{3}-x^{3})+(x^{2}-x^{2})+(x-x)+5`
`=5`
`->` đpcm
`x(x^2+x+1)-x^2(x+1)-x+5`
`=x^3+x^2+x-x^3-x^2-x+5`
`=(x^3-x^3)+(x^2-x^2)+(x-x)+5`
Vậy biểu thức trên không phụ thuộc vào giá trị của biến `x`
Read the following passage and choose the option (A, B, C or D) that best answers each of the questions below. What’s your hobby? Bill: Most people collect things and I’m no exception. I’ve been collecting posters since I was 9 years old. I’m now 14, so you can imagine how many posters I’ve got! I’ve got all sorts - from small ones I’ve found in magazines to very large ones I’ve bought at concerts or sporting events. My favourite poster is one that I have of my favorite film – The Lord of the Rings. It’s more than a meter high and I’ve put it up on my bedroom wall where I can see it when I’m lying in bed. Lauren: My hobby is my music. I sing and play the drums in an all-girl group. We started the group only last year, but we have already played five concerts – two of them at my school! Many people ask me how can I sing when I’m playing the drums. I don’t think it’s at all difficult. Of course I’m not the only singer in the group. Melissa, one of the guitarists, also sings. I really love my hobby and hope that when I grow up I will be in a famous band. 31. When did Bill start collecting posters? A. 5 years ago. B. last year. C. 9 years ago. D. When he was 14 years old. 32. Bill says he’s got posters _____. A. from all over the world B. from magazines only C. from concerts only D. of all sizes 33. The poster that Bill loves best is _____. A. on his bedroom wall B. a small one C. of his favourite group D. was a gift to him 34. How many singers are in Lauren’s band? A. One B. Two C. Three D. Five 35. When she’s older, Lauren says she would like to _____. A. stop playing in a band B. start a new instrument C. be a well-known musician D. attend more famous school
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he often (wear) glasses more often
IV. WRITING Choose the sentences (A, B, C or D) that is closest in the meaning to the root sentence or best combines the two given sentences. 36. It usually takes me two hours to do my homework. A. I usually spend two hours to do my homework. B. Doing my homework needs me two hours. C. Two hours is the time I need to do my homework. D. Two hours are enough for me to do my homework. 37. Staying at home alone scares me. A. I am used to staying at home alone. B. I find staying at home alone scary. C. I don’t like staying at home alone. D. Staying at home alone causes me no fear. 38. My brother has a lot of strange stickers in his collection. A. There are a lot of strange stickers in my brother’s collection. B. My brother has a strange collection of stickers. C. My brother often asks people for strange stickers to put in his collection. D. My brother has the strangest stickers I’ve ever seen in his collection. 39. This math exercise is too difficult for me to solve. A. I have no difficulty solving this math exercise. B. This math exercise is difficult enough for me to solve. C. This math exercise is easy enough for me to solve it. D. This math exercise isn’t easy enough for me to solve. 40. I am keen on walking in the rain. A. I avoid walking in the rain. B. Walking in the rain gives me a lot of pleasure. C. I often have to walk in the rain. D. Walking in the rain makes me feel unpleasant.
Mọi người giải giúp em bài này với ạ Hòa tan hoàn toàn 2,931g hỗn hợp gồm Al và Mg vào dung dịch HNO3 loãng, thu được dung dịch A và 1,568 lít hỗn hợp gồm 2 chất khí không màu có khối lượng 2,59g, trong đó có 1 khí không màu hóa nâu ngoài không khí. Tính %m khối lượng mỗi kim loại trong hỗn hợp. Em xin cảm ơn ạ
Vẽ anime/chibi hơi bùn :'>> - Digi not tradi - Full line, màu tùy tâm __________________________ NL: Tính off lâu lâu tí để luyện trình ai ngờ lúc trước xênh hưn ;-;;;; Mà có ai bít tuii hum :vv???
50 điểm giúp mình bài 2 vs nha mng thx rất nhiều ạ hua vote ctlhn
Chỉ ra và nêu tác dụng của biện pháp tu từ trong hai câu thơ sau: Đêm nay con ngủ giấc tròn Mẹ là ngọn gió của con suốt đời.
Đặt câu với từng từ trong khung giúp mik với :(((((
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