Đáp án + Giải thích các bước giải:
`x^3 + 8y^3`
`= x^3 + (2y)^3`
Áp dụng HĐT : `x^3 + y^3 = (x+y)(x^2-xy+y^2)`
`= (x+2y)[x^2-x*2y+(2y)^2]`
`= (x+2y)(x^2-2xy+4y^2)`
= `x^3 + (2y)^3`
= `(x+2y)[x^2 - 2xy + (2y)^2]`
= `(x+2y)(x^2 - 2xy + 4y^2)`
Help em pls!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
phân biệt hàng hóa và sản phẩm. Cho ví dụ
cảm nhận đoạn dữ liệu từ "trong chiếc áo... cũng được" trong văn bản Tôi đi học
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1. Last Friday was a holiday. I ….. (not have) to go to classes. I ….. (sleep) a little later than usual. Around ten, my friend Larry …… (come) over to my apartment. We ….. (pack) a picnic basket and then ….. (take) the bus to Forest Park. We ….. (spend) most of the day there. 2. Mary and John are neighbors. They ….. (know) each other for several years. Mary ….. (move) into her house in 1985, and John has lived….. (live) next door since he …came… (come) to the area in 1980. 3. Dear Jill, Here I am in New York! I ….. (be) here for 2 weeks now and it ….. (be) very interesting. My friend, Nancy who I …met.. (meet) in London in 1982 …… (live) in New York for 3 years, so she ….. (know) all about it. Yesterday we …went.. (go) to China town and …ate.. (eat) hot dog there. We ….. (visit) the Statue of Liberty this Sunday. 4. Mrs Reed ….. (turn) on the radio in her car while she ….. (drive) home yesterday. She…was listening.. (listen) to some music when she suddenly …heard.. (hear) a siren. She ….. (look) in her mirror and ….. (see) an ambulance behind her. She immediately….. (pull) her car to side of the road and ….. (wait) for ambulance to pass.
April la gi? collect la gi? august la gi?
Giúp mình với!!! 21. You must promise………………………………….( not / be ) late again. 22. They refused………………..( lend ) him the money although he needed it badly. 23. Please, don’t forget………………………( post ) the letter for me today ! It’s urgent. 24. However, she did not plan……………..……………( be ) a secretary all her life. 25. But she couldn’t imagine…………..…………..( do ) the same job for years and years. 26. The only thing that prevented her from…………….( study ) law was a lack of time and money. 27. She remembered ………………………..( talk ) to her father before he became ill. 28. You must remember …………………………( buy ) some sugar. We haven’t got any now. 29. I am looking forward to ………….…………………………… (see) you
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