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I . 1, "I' ll come and see you tomorrow she said.............................. 2, I wrote to my parents yesterday Hoa told me ( that).......................... 3. Why don't you learn to speak Japanese at this center Yoko asked me.................... 4. Jim phoned me last week Liz told us ( that) ...................... 5. Do you like food here The restaurant owner asked us............................. 6. My sister, Linh, is arriving here today Hoa said ( that) ................... 7....
Đọc tiếp

I .

1, "I' ll come and see you tomorrow

she said..............................

2, I wrote to my parents yesterday

Hoa told me ( that)..........................

3. Why don't you learn to speak Japanese at this center

Yoko asked me....................

4. Jim phoned me last week

Liz told us ( that) ......................

5. Do you like food here

The restaurant owner asked us.............................

6. My sister, Linh, is arriving here today

Hoa said ( that) ...................

7. Did you play a lot of tennis last week

Nam and Liz.............................................

8.I guess you bought these toys at the supermarket tow days ago

She told me......................................

9. I'm going to New York tomorrow

She said.....................

10. I'm here for a short holiday

She siad........................

11. Why are you so late

The teacher asked me....................................

12. Speak English with your friends

the teacher asked us........................................

1
7 tháng 10 2018

I .

1, "I' ll come and see you tomorrow

she said she would come and see me the next day

2, I wrote to my parents yesterday

Hoa told me ( that) she had written to her parents the day before

3. Why don't you learn to speak Japanese at this center

Yoko asked me why I didn't learn to speak Japanese at that center

4. Jim phoned me last week

Liz told us ( that) Jim had phoned her the previous week

5. Do you like food here

The restaurant owner asked us if we liked food there

6. My sister, Linh, is arriving here today

Hoa said ( that) her sister, Linh, was arriving there then

7. Did you play a lot of tennis last week

Nam and Liz asked me if I had played a lot of tennis the previous week

8.I guess you bought these toys at the supermarket tow days ago

She told me that she guessed I had bought those toys at the supermarket two days before

9. I'm going to New York tomorrow

She said she was going to New York the next day

10. I'm here for a short holiday

She siad she was there for a short holiday

11. Why are you so late

The teacher asked me why I was so late

12. Speak English with your friends

the teacher asked us to speak english with our friends

13 tháng 12 2017

\(\dfrac{1}{1-x}\)+\(\dfrac{1}{1+x}\)+\(\dfrac{2}{1+x^2}\)+\(\dfrac{4}{1+x^4}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=

=\(\dfrac{4}{1-x^4}\)+\(\dfrac{4}{1+x^4}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{8}{1-x^8}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{16}{1-x^{16}}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{32}{1-x^{32}}\)

8 tháng 8 2015

a) Ta có I 2x - 1 I = 2015

=> 2x-1=2015 hoặc 2x-1=2015

+,Th1: 2x-1=2015

             2x=2015+1

             2x=2016

              x=2016:2

             x=1008

+,Th2: 2x-1=-2015

              2x=-2015+1

             2x=-2014

              x=-2014:2

             x=-1007

Vậy x=1008, x=-1007

 

 

|x-1|<5

th1: x-1<5=> x<6

th2: x-1<-5=> x<-4

vậy x <6 hoặc<-4

|x-1|>5 cũng tương tự như thế

còn mấy câu khác Nguyễn Diệu Thảo làm thế chắc bạn cũng biết cách làm rồi

L_I_K_E CHO MÌNH NHA!!!

26 tháng 7 2019

I I  là dấu giá trị tuyệt đối nhé

26 tháng 7 2019

|7 + 5x| = 1 - 4x

=> \(\orbr{\begin{cases}7+5x=1-4x\left(đk:x\le\frac{1}{4}\right)\\7+5x=4x-1\left(đk:x\ge\frac{1}{4}\right)\end{cases}}\)

=> \(\orbr{\begin{cases}7-1=-4x-5x\\7+1=4x-5x\end{cases}}\)

=> \(\orbr{\begin{cases}6=-9x\\8=-x\end{cases}}\)

=> \(\orbr{\begin{cases}x=-\frac{2}{3}\left(tm\right)\\x=-8\left(ktm\right)\end{cases}}\)

|4x- 2x| + 1 = 2x

=> |4x2 - 2x| = 2x - 1

=> \(\orbr{\begin{cases}4x^2-2x=2x-1\left(đk:x\ge\frac{1}{2}\right)\\4x^2-2x=1-2x\left(đk:x\le\frac{1}{2}\right)\end{cases}}\)

=> \(\orbr{\begin{cases}4x^2-2x-2x+1=0\\4x^2-2x-1+2x=0\end{cases}}\)

=> \(\orbr{\begin{cases}\left(2x-1\right)^2=0\\4x^2-1=0\end{cases}}\)

=> \(\orbr{\begin{cases}2x-1=0\\x^2=\frac{1}{4}\end{cases}}\)

=> \(\orbr{\begin{cases}x=\frac{1}{2}\\x=\pm\frac{1}{2}\end{cases}}\)(tm)

Vậy ...

NV
27 tháng 4 2019

a/ Để BPT nghiệm đúng với mọi x:

\(\left\{{}\begin{matrix}a=m-1>0\\\Delta'=\left(m-1\right)^2+\left(m-1\right)\le0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m>1\\m\left(m-1\right)\le0\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m>1\\0\le m\le1\end{matrix}\right.\) \(\Rightarrow\) không tồn tại m thỏa mãn

b/ Để BPT vô nghiệm

\(\Leftrightarrow\left(m-4\right)x^2-5\left(m-4\right)x-2\left(m-4\right)\le0\) nghiệm đúng \(\forall x\)

- Với \(m=4\) BPT trở thành \(0\le0\) (đúng)

- Với \(m\ne4\):

Hệ điều kiện:

\(\left\{{}\begin{matrix}a=m-4< 0\\\Delta=25\left(m-4\right)^2+8\left(m-4\right)^2\le0\end{matrix}\right.\) \(\Rightarrow\) không tồn tại m thỏa mãn

Vậy \(m=4\) thì BPT vô nghiệm

27 tháng 4 2019

b/ tại sao bất pt vô nghiệm lại ≤ 0 vậy bạn

6 tháng 9 2017

Phát âm:

1.A.equal B.fashion C.champagne D.match

1.A.economy B.occasion C.freedom D.logical

1.A.invite B.river C.shrine D.primary

1.A.encourage B.proud C.enough D.young

1.A.invited B.arrived C.mentioned D.loved

Trọng âm:

1.A.practical .B.designer C.minority D.occasion

1.A.consist B.fashion C.design D.collect

6 tháng 1 2018

Từ đề bài, ta có: l1 = l0 + x1

l2 = l0 + x2

=> l2 - l1 = l0 + x2 - (l0 + x1) = l0 + x2 - l0 - x1 = x2 - x1

Vậy ta chọn A. l2 - l1 = x2 - x1

6 tháng 1 2018

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