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which dress do you like best?" she asked her boyfriend.She asked her boyfriend......................................... .........................."What are they doing?" she asked.She wanted to know.............................................. ....................."Are you going to the cinema?" he asked me.He wanted to know.............................................. .....................The teacher asked, "Who speaks English?"The teacher wanted to...
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  1. which dress do you like best?" she asked her boyfriend.
    She asked her boyfriend......................................... ..........................
    "What are they doing?" she asked.
  2. She wanted to know.............................................. .....................
  3. "Are you going to the cinema?" he asked me.
    He wanted to know.............................................. .....................
  4. The teacher asked, "Who speaks English?"
    The teacher wanted to know.............................................. .....................
  5. "How do you know that?" she asked me.
    She asked me................................................ ...................
  6. "Has Caron talked to Kevin?" my friend asked me.
    My friend asked me................................................ ...................
  7. Which dress do you like best?" she asked her boyfriend.
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     She asked her boyfriend..............................................................
  8. when will we meet again ? she asked me
    →" role="presentation" style="border:0px; direction:ltr; display:inline; float:none; font-size:14.6667px; font-weight:normal; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">
     she asked me ......................................................................................
  9. '' are you crazy ? '' she asked him
    →" role="presentation" style="border:0px; direction:ltr; display:inline; float:none; font-size:14.6667px; font-weight:normal; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">
     she asked him ..............................................................................................
  10. where did they live ? '' he asked
    →" role="presentation" style="border:0px; direction:ltr; display:inline; float:none; font-size:14.6667px; font-weight:normal; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">
     he wanted to know ............................................................................
2
16 tháng 3 2020

1.She asked her boyfriend which dress he had done best

2.She wnted to know what they had been done

3.He wantesd to know if you had gone to the cine ma

22 tháng 3 2020

1.She asked her boyfriend which dress he d best.

2.She wanted to know what they were doing.

3.He wanted to know if i was going to the cinema.

4.The teacher wanted to know who spoke English.

5.She asked me how i knew that.

6.My friend asked me if Caron had talked to Kevin.

8.She asked me when we would meet again.

9.She asked him if he was crazy.

10.He wanted to know where they had lived.

24 tháng 3 2020

1. Nhà văn để nhân vật ý thức về bản thân mình.

Cách nói này bộc lộ phương châm về chất.

2. Con đường chạy qua cao điểm: (tìm chi tiết sách giáo khoa)

-> Nguy hiểm, đối mặt với cái chết.

16 tháng 3 2020

\(ĐKXĐ:\hept{\begin{cases}a\ge0\\a\ne\frac{1}{9}\end{cases}}\)

\(P=\left(\frac{\sqrt{a}-1}{3\sqrt{a}-1}-\frac{1}{1+3\sqrt{a}}+\frac{8\sqrt{a}}{9a-1}\right)\div\left(1-\frac{3\sqrt{a}-2}{3\sqrt{a}+1}\right)\)

\(\Leftrightarrow P=\frac{\left(\sqrt{a}-1\right)\left(1+3\sqrt{a}\right)-3\sqrt{a}+1+8\sqrt{a}}{9a-1}:\frac{3\sqrt{a}+1-3\sqrt{a}+2}{3\sqrt{a}+1}\)

\(\Leftrightarrow P=\frac{\sqrt{a}+3a-1-3\sqrt{a}-3\sqrt{a}+1+8\sqrt{a}}{\left(3\sqrt{a}-1\right)\left(3\sqrt{a}+1\right)}:\frac{3}{3\sqrt{a}+1}\)

\(\Leftrightarrow P=\frac{\left(3a+3\sqrt{a}\right)\left(3\sqrt{a}+1\right)}{3\left(3\sqrt{a}-1\right)\left(3\sqrt{a}+1\right)}\)

\(\Leftrightarrow P=\frac{a+\sqrt{a}}{3\sqrt{a}-1}\)

22 tháng 3 2020

1, 

Tam giác ABC có CA=CB và ACB=90 => ACB vuông cân

16 tháng 3 2020

\(P=\frac{\left(a-b\right)^2\left(6a^2b^2+3a^3b+3ab^3+4\right)}{4ab}+\frac{17}{4}\ge\frac{17}{4}\)

Đẳng thức xảy ra khi \(a=b=\frac{1}{2}\)

16 tháng 3 2020

bạn làm khó hiểu quá .

16 tháng 3 2020

Vì 1 lý do nào đó mà mình đoán mò được y = 1 và x = 3

21 tháng 3 2020

Mk không biết tải hình lên, xin lỗi bn nhé.

a) Do AB là đường kính của (O) nên

\(\Rightarrow\widehat{ACB}=\widehat{ADB}=90^0\)

Xét tứ giác CEDF có : \(\widehat{ECF}+\widehat{EDF}=180^0\)

\(\Rightarrow ECDF\)là tứ giác nội tiếp (ĐPCM)

b) Do \(\widehat{ECF}=\widehat{EDF}=90^0\)nên ECDF nội tiếp đường tròn đường kính EF

Hay ECDF nội tiếp (I;IE) nên

\(\widehat{IDF}=\widehat{IFD}=\widehat{ECD}=\frac{1}{2}sđ\widebat{BD}=\widehat{OAD}=\widehat{ODA}\)

Từ đó ta có: \(\widehat{IDO}=\widehat{IDE}+\widehat{OAD}=\widehat{IDE}+\widehat{IDF}=90^0\)

\(\Rightarrow\)ID là tiếp tuyến của đường tròn (O) (ĐPCM)

21 tháng 3 2020

Ta có

\(A=\frac{x^2+2x-1}{x^2-2x+3}\left(ĐKXĐ:\forall x\inℝ\right)\)

\(\Leftrightarrow A.\left(x^2-2x+3\right)=x^2+2x-1\)

\(\Leftrightarrow\left(A-1\right).x^2-2\left(A+1\right)x+3A+1=0\left(1\right)\)

Do \(\forall x\inℝ\)ta luôn có một giá trị A tương ứng nên phương trình (1) luôn có nghiệm

\(\Rightarrow\Delta^'_x\ge0\)

\(\Leftrightarrow\left(A+1\right)^2-\left(3A+1\right)\left(A-1\right)\ge0\)

\(\Leftrightarrow-2A^2+4A+2\ge0\)

\(\Leftrightarrow1-\sqrt{2}\le A\le1+\sqrt{2}\)

Nếu \(A=1-\sqrt{2}\)thì thay vào trên ta được \(x=1-\sqrt{2}\)

Nếu \(A=1+\sqrt{2}\)thì thay vào trên ta được 

Vậy \(\hept{\begin{cases}MinA=1-\sqrt{2}\Leftrightarrow x=1-\sqrt{2}\\MaxA=1+\sqrt{2}\Leftrightarrow x=1+\sqrt{2}\end{cases}}\)