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 giúp mik vs Mary has answered the teacher's question, __________? A. has heB. didn't sheC. hasn't she2.Your coat got wet yesterday, ____________?A. didn't youB. didn't itC. doesn't it3.I'm early, ________?A. am IB. are not IC. aren't I4.Those plates are very dirty, ___________?A. are theyB. aren't theyC. weren't they5.Mrs. Lan was sick, ____________?A. was heB. wasn't sheC. isn't she6.The costumes look gorgeous, ____________?A. don't theyB. can't theyC. can you7.My pen is blue. His pen is...
Đọc tiếp

 giúp mik vs 

Mary has answered the teacher's question, __________? 

A. has he

B. didn't she

C. hasn't she

2.

Your coat got wet yesterday, ____________?

A. didn't you

B. didn't it

C. doesn't it

3.

I'm early, ________?

A. am I

B. are not I

C. aren't I

4.

Those plates are very dirty, ___________?

A. are they

B. aren't they

C. weren't they

5.

Mrs. Lan was sick, ____________?

A. was he

B. wasn't she

C. isn't she

6.

The costumes look gorgeous, ____________?

A. don't they

B. can't they

C. can you

7.

My pen is blue. His pen is red,____________?

A. isn't he

B. aren't I

C. isn't it

8.

We designed our own house, ____________?

A. didn't they

B. did we

C. didn't we

9.

It's getting colder, ____________?

A. is it

B. isn't it

C. isn't he

10.

Everyone has left the dangerous area,____________?

A. haven't they

B. isn't it

C. are they

11.

Everything happens for a reason,____________?

A. is it

B. doesn't it

C. aren't they

12.

Everyone must observe traffic regulations,____________?

A. must they

B. mustn't they

C. mustn't we

13.

Hardly a day goes by without thinking of her,____________?

A. is it

B. does it

C. doesn't it

14.

She has never been to Ha Long Bay,____________?

A. has she

B. hasn't she

C. is she

15.

Someone has told him about her death,____________?

A. have they

B. haven't they

C.hasn't he

2

1) hasn't she

2) didn't it

3) aren't I

4) aren't they

5) wasn't she

6) don't they

7) isn't it

8) didn't we

9) isn't it

10) haven't they

11) doesn't it

12) mustn't they

13) does it

14) has she

15) haven't they

8 tháng 4 2020

1.hasn't she

2.didn't it

3.aren't I

4.aren't they

5.wasn't she

6.don't they

7.isn't it

8.didn't we

9.isn't it

10.haven't they

11.doesn't it

12.mustn't they

13.does it

14.has she

15.haven't they

5 tháng 4 2020

P M E B A O C

5 tháng 4 2020

a ) Ta có : PA // BC => ^MPE = ^ECB = ^PBM  vì PB là tiếp tuyến của (O)

=> \(\Delta MPE~\Delta MBP\left(g.g\right)\)

\(\Rightarrow\frac{MP}{MB}=\frac{ME}{MP}\Rightarrow MP^2=ME.MB\)

b ) .Ta có MA là tiếp tuyến của (O)

\(\Rightarrow\widehat{MAE}=\widehat{MBA}\Rightarrow\Delta MAE~\Delta MBA\left(g.g\right)\)

\(\Rightarrow\frac{MA}{MB}=\frac{ME}{MA}\Rightarrow MA^2=ME.MB\)

\(\Rightarrow MA^2=MP^2\Rightarrow MA=MP\Rightarrow M\) là trung điểm PA 

5 tháng 4 2020

toán 60

văn 15

5 tháng 4 2020

toán thì là 60

văn thì là 15 nhé

5 tháng 4 2020

\(P=\frac{\sqrt{x}-1}{\sqrt{x}}-9\sqrt{x}=1-\left(\frac{1}{\sqrt{x}}+9\sqrt{x}\right)\)

\(\frac{1}{\sqrt{x}}+9\sqrt{x}\ge2\sqrt{\frac{1}{\sqrt{x}}\cdot9\sqrt{x}}=6\)

\(\Rightarrow P\le1-6=-5\)

Dấu "=" xảy ra khi \(\frac{1}{\sqrt{x}}=9\sqrt{x}\Leftrightarrow x=\frac{1}{9}\)

Vậy Max=-5 đạt được khi \(x=\frac{1}{9}\)