\(\left(2x-5\right)^2-64\)

\(=4x^2-20x-39\)

\(=\left(2x+3\right)\left(2x-13\right)\)

\(x^3+x^2+4\)

\(=x^3+2x^2-x^2-2x+2x+4\)

\(=x^2\left(x+2\right)-x\left(x+2\right)+2\left(x+2\right)\)

\(=\left(x+2\right)\left(x^2-x+2\right)\)

1, is cooking

2, is reading

3, are your brothers gardening at the moment ?

4, don't love

5, Do you watch Tv after school ?

No, I don't. I play chess.

1. A.number B.software C.manage D.invent

2. A.become B.hardware C.letter D.music

3. A.matter B.happen C.listen D.below

4. A.explain B.problem C.study D.worry

5. A.habit B.become C.learner D.mother

6. A.fifteen B.fifty C.center D.biggest

7. A.student B.member C.prefer D.teacher

8. A.subject B.hello C.teacher D.thousand

9. A.lesson B.woman C.repair D.father

10. A.above B.sister C.widen D.very

gọi số hs đó là a

ta có: a chia 12;15;18 dư 3

=>a-3 chia hết cho 12;15;18

=>a- thuộc BC(12;15;18)

Bcnn(12;15;18)=180

=> a- 3 thuôc B(180)={0;180;360;...}

=>a thuộc {3;183;363;...}

vì 200<a<400

nên a=363

Đổi 100 cm³ = 0,0001 m³

Lực đẩy Acsimet tac dụng lên khối gỗ đó là :

\(F_A=d\cdot V=10000\cdot0,000,=1\left(N\right)\)

Vậy Lực đẩy Acsimet tac dụng lên khối gỗ đó là : 1N

1.He(play) is playing volleyball but he (not enjoy) doesn't enjoy it

2.School childen wear/have to wear (wear) uniform on monday

3.My brother has written (write) three books

4 .Taam always gets (get) grade A for Physics but last semester he got (get) grade B

5. He never talk (talk) to his neighbor

6 .They did not try (try) to learn all words they could not write (write) well

7. Minh's teachher wants him to spend (spend) more time on Literature

8. We studied(study) a vetu hard lesson yesterday

9 .My wife and i travelled (travel) to Mexico by air last summer

10. The girls haven't had (not have ) their lunch yet

1. Her hair is long and black.

She has long black hair.

2. Lan has a toothache.

She should go to the dentist.

3. The red dictionary is more expensive than the blue dictionary.

The blue dictionary is not as expensive as the red dictionary.

4. We took a train to Leverpool last Saturday.

We went to Liverpool by a train last saturday.

5. Where can I find the station?

Could you show me the way to the station ?

a,

\(\left(x-1\right)\cdot\left(y+2\right)=7\)

Lập bảng ta có :