27500 mình lm rùi nên biết

Võ Đông Anh Tuấn

1, how old ................your mother?

=>is

2,my books ............on the table

=>is

3,............your brother 18 years old?

=>is

4, there..........45 students in our class

=>are

5,...........there a board on the wall?

=>is

6, you and i...........doctor

=>are

7,.................i your teacher?

=>am

8,no, you are not my sister

Câu 8 bn viết thừa đề

1.Do you belive that eating________carrots helps you see at night.

A.most                      B.less                     C.the most                        D.much more

2.Don't eat that type of fish ,you may have a/an______________.

A.energy                 B.sick                     C.sore                    D.allergy

3.The seafood i eat this morning makes me feel__________all over.

A.well                  B.weak                  C.itchy                   D.running

4.We should try to keep everything around us clean and then flu with find it ___________to spead.

A.difficult             B.difficulty            C.difficulties             D.like

5.The health___________from that diet expert is that die expert is that you should eat less junk food and count your calories if you are becoming fat.

A.advices             B.ideas                 C.tip                      D.tips

6.Be careful with_________you eat and drink.

A.who                  B.what                   C.that                     D.this

7.Have a health_________and you can enjoy your life.

A.lives                  B.lifestyle            C.lifeline                 D.lively

8.Eating a lot of junk food may lead to your_________.

A.fitness                B.obesity             C.pain                    D.stomachache

9.We should follow the activities from doctor and health__________in order to keep fit.

A.workers               B.people                    C.experts                      D.managers

10.You can avoid some diseases by making yourself clean.

\(\sqrt{a}+\sqrt{b}=1\Rightarrow\left(\sqrt{a}+\sqrt{b}\right)^2=1\)

\(\Rightarrow a+b+2\sqrt{ab}=1\)

\(\Rightarrow1-2\sqrt{ab}=a+b\)

Ta có

\(\left(4\sqrt{ab}+1\right)^2\ge0\)

\(\Rightarrow16ab-8\sqrt{ab}+1\ge0\)

\(\Rightarrow8\sqrt{ab}\left(1+2\sqrt{ab}\right)\le1\)

\(\Rightarrow8\sqrt{ab}\left(a+b\right)\le1\)

\(\Rightarrow64ab\left(a+b\right)\le1\)

\(\Rightarrow ab\left(a+b\right)\le\frac{1}{64}\)

(đpcm)

lại lên đây ns giúp là sao.................Rảnh k có chuyện gì là hay sao hả

dc chưa bn

lúc sáng mk lm rùi mak

Các phần tử thuộc I có dạng m^2 với -1 <m <5

Các phần tử thuộc K thì mmooix số cách nhau 2k đơn vị

Vời k lần lượt là 1;2;3