1 saw- would be

2 found - would take

3 would be - told

4 stay - won't see

5 will learn - have

6 will be - don't go

7 gives - will feel

8 wouldn't go - rained

9 would solve - knew

10 would you do - had

1. saw- would be

2. found - would take

3. would be - told

4. stay - won't see

5. will learn - have

6. will be - don't go

7. gives - will feel

8. wouldn't go - rained

9. would solve - knew

10. would you do - had

\(y'=3x^2-6x\)

a.

Ta có: \(y'\left(2\right)=3.2^2-6.2=0\)

Tiếp tuyến tại M có dạng:

\(y=0\left(x-2\right)-2\Leftrightarrow y=-2\)

b.

Tiếp tuyến song song với \(y=-3x+2014\) nên có hệ số góc k thỏa mãn \(k=-3\)

Gọi hoành độ tiếp điểm là \(x_0\Rightarrow y'\left(x_0\right)=-3\)

\(\Rightarrow3x^2_0-6x_0=-3\Leftrightarrow3\left(x_0-1\right)^2=0\Rightarrow x_0=1\)

\(\Rightarrow y_0=0\)

Phương trình tiếp tuyến:

\(y=-3\left(x-1\right)+0\Leftrightarrow y=-3x+3\)

c.

Tiếp tuyến vuông góc với \(y=-\dfrac{1}{3}x+2013\) nên có hệ số góc thỏa mãn:

\(k\left(-\dfrac{1}{3}\right)=-1\Rightarrow k=3\)

Gọi hoành độ tiếp điểm là \(x_0\Rightarrow y'\left(x_0\right)=3\)

\(\Rightarrow3x^2_0-6x_0=3\Rightarrow\left[{}\begin{matrix}x_0=1+\sqrt{2}\Rightarrow y_0=-\sqrt{2}\\x_0=1-\sqrt{2}\Rightarrow y_0=\sqrt{2}\end{matrix}\right.\)

Có 2 tiếp tuyến thỏa mãn: \(\left[{}\begin{matrix}y=3\left(x-1-\sqrt{2}\right)-\sqrt{2}\\y=3\left(x-1+\sqrt{2}\right)+\sqrt{2}\end{matrix}\right.\)

=(1,25 x4) x13,8

=5 x 13,8

=69

B. = 69

C. = 694

Trả lời:

Geography

geography

Geography

1. Have read

2. Was doing - sent - had given

3. Was doing
4. Will be living
5. Will be working
6. Finish
7. Looked - was trying
8. Were - had started - got
9. Have worked
10. Have ever met
11. Came - had stood 
12. Had buzzed - answered
13. Had - was repairing 
14. Saw - was sitting - told - had been reading
15. Was weeding - was cutting
16. Will be waiting 

my 

school

makes

plays

doesn't

1. my

2. school

3. makes

4. plays

5. doesn't

Không có file nghe b ơi