Đáp án + Giải thích các bước giải:
`x(2x+1)-x^{2}(x+2)+x^{3}-x+3`
`=2x^{2}+x-x^{3}-2x^{2}+x^{3}-x+3`
`=(x^{3}-x^{3})+(2x^{2}-2x^{2})+(x-x)+3`
`=3`
`->` đpcm
Hướng dẫn trả lời:
`x.(2x+1)-x^2.(x+2)+x^3-x+3.`
`= 2x^2 + x - x^3 - 2x^2 +x^3 - x + 3.`
`= (- x^3 + x^3) + (2x^2 - 2x^2) + (x - x) + 3.`
`= 3. (đpcm)`
Vậy giá trị biểu thức `x.(2x+1)-x^2.(x+2)+x^3-x+3` không phụ thuộc vào giá tri của biến x.
Give the correct form of the verbs in the brackets to complete the sentences. 22. Mr. Green (play) ________ chess since eight o'clock. 23. We should (practice) _________English everyday. 24. We won't go to the beach tomorrow if it (rain)________ 25. Our school performance (start) ________ late last Sunday because of the heavy rain.
Vẽ đâu mầm, hãy kể tên người bn thân nhất trên hoidap
rewrite the sentences in passive voice 1 they have opened a new shop 2 rick has interviewed the lady 3 I have bought the ticked 4 we have not sold the bike 5 tim has forgotten the sandwiches 6 he has not cleaned the kitchen yet 7 Joe and Gerry have never played rugby 8 somebody has stolen Peter's car 9 she has not used the tablet for day
a,Tính khối lượng bàng đơn vị cacbon của 3C,5S b,Tính khối lượng bằng gam của nguyên tử Mg
There is one mistake in each of the following sentences. Find and correct it. 17. I am looking forward to see you as soon as possible. ..................... 18. Would you please to fill in the form and wait for some minutes? ..................... 19. She goes to the market one a week. ..................... 20. Hung hasn't visited their grandparents in Hue City last summer. .................... .21. The weather in Dong Hoi City is the most driest in the region. ...................
vẽ harry potter , full màu , ko vẽ giấy ôli , vẽ có tâm xíu nha
Cho CuO tác dụng với 245g dung dịch H2SO4 có nồng độ 30% thu được 32g muối. Tính nồng độ % các chất thu được sau phản ứng Đáp án: C% H2SO4 = 20,65% C% CuSO4 = 12,26%
Điền các chữ: skip class, bully, offensive, shows disrespect, warning
Giúp mình bài dưới với ạ, tks mn
58. Hyde Park / a / place / for / good / in / is / fine / weather / camping /. / 59. Jane / with / promised / keep / in / has / touch / is / us / to / while / in / she / Australia. 60. What / do / of / English / you / learning / find / most / aspect / difficult /? / 61. If / down / in / there / will / you / forests / be / floods / cut / trees /, / big / the / every year / the /. / 62. The / convenient / Internet / a fast / and / way / to get / update / information / is / which / is /. / 63. Keep / passport / asked / in case / you / your / are / to / it / at / handy / customs / show /. /
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