tìm M để có nghiệm  và tính tổng,  tính các nghiệm

 4x^{2 - 2x + m -3 = 0}

^{ggigiugiúgiúpgiúp mmiminminhminhhminhh vvsvssvsssvsss aaa}

Lm hộ mk bài 3 vs ạ

Giúp mk vs ạ mk đg cần gấp

Giúp mk vs ạ

1. ''Where's the old chicken cooop?"" '' It.... by a windstorm last yaer''.

a, destroy   b, is destroyed   c, was destroyed   d, destroyed

2. ''We're stiil looking for thomas''. ''Hasn't he..... yet?".

a, been found   b, to find   c, found    d, being found

3. ''Whatever happened that fortune- teller?'' '' idon't know. she..... around her in a long time'',

a, hasn't seen   b, didn't see     c, hasn't been seeing   d, hasn't beeb seen

4. '' Diana is a wonderful ballet dancer''. ''she..... since she was found''.

a, has been dancing   b, has been danced   c, is dancing   d, was danced

5. ''What a beautiful dress you're wearing!'' '' Thank you,It..... especially for me by a french tailor''.

a, is made   b, has made   c, made    d, was made

6. ''Those eggs of different colors are very artistic''. ''Yes. they.....in russia''.

a,were painted    b, were pain    c, were painting    d. painted

7.'' homer is in jail for smoking marijunana''.

 '' he..... that it was against the law''.

a, is telling    b, was told    c, old    d, tells 

8.'' the maintenance people didn't remove the chairs from the ballroom''.

  '' don't worry, they........ them before the dance begins''.

a, will have beeb moved    b,  has been discovered   c, was didcover  d, they didcovered

9. ..........that military spending is extremely higt.

a, we are felt   b. it feels   c, it is felt   d, we feel that it is

10.all planes.....before departure.

a, wiil checked   b, will has checked   c, will be checked   d, will been checked

11. i wanted..... by the hear of the company,byt is was impossible.

a, to see   b, to be seen    c, seeing      d, being to she

12.katherine...... at bob;s hous every night this week.

a, has beeb eaten   b, has eating   c, is being eating     d, has beeb eating

13.''whre did you get these old dresses?''.

'' we..... them in the old runk''.

a,were found   b, finding   c, found     d, have beeb found

14.'' what happened to the old mail carrier''.

 '' he.......to a new neighborhood to work''.

a, has sent    b, was send    c, was sent    d, sent

1. The longest fish in the contest was eighteen inches long''. ''It ......... by thelma rivers''.

a, was catching                    b, caught                 c, was caught         d, catch

2.'' I heard you decided to take up tennis''.    ''Yes, i have ...... every day''.

a, been played    b, been playing   c, playing       d, play

3. '' Are we about to have dinner?''.  Yes, it...... in the dinning room''.

 a,is serving    b, serves     c, is being served     d, served

4.''Why is stanley in jail?''.'' He ......of robbery''.

a,has been convicted   b, has been convicting   c, has convicted   d, convicted

5. '' Where are jack and jan?'' '' Thay ........ the boxes you asked for into the house''. 

a, have been bringging    b, bringging     c, have beeb brought   d, to bring