Đáp án:
Giải thích các bước giải:
Đáp án:a. -1; 3/2
b. 2;-1
c. ±√3
a. 2x²-x-3=0⇔(x+1)(2x-3)=0⇔x=-1 hoặc x=3/2
b. ⇔$\left \{ {{4x-6y=14} \atop {9x+6y=12}} \right.$ ⇔13x=26⇔x=2⇒y=-1
c. x^4 +x^2-12=0⇔(x²+4)(x²-3)=0⇔x²=3⇔x=±√3 ( vì x²+4>0)
Tìm GTNN của biểu thức sau Q= (x^2-9) + |y-2|+ 10 E đg cần gấp trc 8h ak! Cảm ơn mn!
Tại sao nói : cách mạng tư sản Anh là cuộc cách mạng không triệt để ?
X. Write the second sentence so that it has the same meaning to the first one. Use the word in brackets. 1. This show is the same as the show we saw last week. (different) → This show 2. She is the quickest runner at all. (quick) → No other runner 3. She hasn’t made as many mistakes as last time. (fewer) → She 4. The Eiffel Tower is as high as an 81-storey building. (same) → The Eiffel Tower 5. Steven Spielberg directed Jurassic Park. (by) → Jurassic Park 6. This painting isn’t so expensive as my favourite painting. (than) → My favourite painting 7. My English is better than my French. (as) → My French 8. John hasn’t done any housework for a month. (ago) → The last time John I. Choose the word whose underlined part is pronounced differently from the others. 1. a. bread b. beef c. meat d. tea 2. a. audience b. sauce c. sausage d. taught 3. a. eggs b. cups c. cartons d. noodles 4. a. soup b. salt c. sauce d. sugar 5. a. fridge b. rice c. spinach d. milk II. Choose the odd one out. 1. a. juice b. sandwich c. lemonade d. milk 2. a. sweet b. sour c. salty d. sauce 3. a. egg b. pork c. beef d. ham 4. a. cheese b. salt c. orange d. bread 5. a. bowl b. glass c. plate d. fork
Giúp mình phần 1 la mã với ạ 😭😭
the distance between HAI DUONG and HA NOI is 80km -It's giup mk voi chuyen cau o tren thanh cau co tu It's o dau
giúp em phần Writing skills với ạ làm phần a và b thôi ạ
"Lớp trẻ VN cần nhận ra những cái mạnh,cái yếu của con người VN để rèn những thói quen tốt khi bước vào nền kinh tế mới " (Chuẩn bị hành trang bước vào thế kỉ mới - Vũ Khoan) 1.Câu văn trên có vai trò như thế nào trong văn bản? 2.Những yêu cầu,nhiệm vụ hết sức to lớn và cấp bách đang đặt ra cho đất nước ta,cho thế hệ trẻ hiện nay là gì? mk đang cần gấp nha!
V. Read the folowing passage and answer the questions: In Western countries, electricity, gas, and water are not luxury but necessities.Company now realize that consumers want products that will not only work effectively, but also save money. For most North American households, lighting acounts for 10 percent to 15 percent of the electricity bill. However, this amount can reduced by replacing an ordinary 100-watt light bulb with an energy saving bulb. These bulbs use a quarter of the electricity of standard bulbs and last eight time longer. Therefore cosumers can save about US7 to US21 per bulb. In Europe, there is a labeling scheme for refrigerators, freezers, washing machines and tuble dryers. The lable tell the consumers how much energy efficiency each model has, compared with other appliences in the same category. Ultimately, these inovations will save money as well as coserve the Earth’s recources. Questions: 1, What are Western cosumers interested in? ………………………………………………………………………………………… 2, What can we do to spend less on lighting? ………………………………………………………………………………………… 3, What is the purpose of labeling scheme? ………………………………………………………………………………………… 4. Why should we save energy? ………………………………………………………………………………………… 5. Are electricity, gas, and water luxury in Western countries? …………………………………………………………………………………………
Giúp mik nha cảm ơn các bn.2 câu 20đ
câu 8 ạ giúp mk đi ạ @duyennguyen1997
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