(2+4+6+8+...+100)*(58*8-116*4)

=(2+4+6+8+...+100)*(58*2*4-116*4)

=(2+4+6+8+...+100)*(116*4-116*4)

=(2+4+6+8+...+100)*0

=0

A.home                                             B.house

C.honor                                            D.hole

Đáp án ở đây là C

Thế thì dễ

1.      The sun (set) sets in the West.

2.      It usually (rain) rains in the summer.

3.      They (build) are building the buildings at the moment.

4.      Bees (make) make honey.

5.      They (get) are getting on the scale now.

6.      The earth (circle) circles the Sun once every 365 days.

7.      Rivers usually (flow) flows to the sea.

8.      Don’t worry. I (give) gived him your message when I (see) saw him.

9.      Look! Jane (play) is playing  the guitar. Hurry up! The bus (come) is coming .

10.  I (not talk) am not talking to her at present.

11.  How often does she (go) go fishing?

            - She (go) goes once a year.

12.  Are your friends students?

            -Yes, they (be) are.

13.  Are the children (play) playing in the park at the moment?

            -No, they aren’t. They (learn) are learning to play the piano.

14.  Do you (go) go to school on Sundays? – Yes, I do.

15.  My mother (cook)  is cooking a meal now. She ( cook) cooks everyday.

16.  What will your mother (do) be doing at this time?

            - She (make) will be making a dress.

17.  Does she often (go) go to the cinema every weekend?

18.  I don’t know. But she always (go) goes to the church on Sundays.

19.  The students (not be) aren't in class at present.

20.  She always (wash) washes the dishes after meals.

           (do) Be doing  an exercise on the present tenses at this moment and I (think) think that I (know) am knowing  how to use it now.

21.  My mother sometimes (buy) buys vegetables at this market.

22.  It (rain) rains  much in summer. It (rain) is raining  now.

23.  Daisy (cook) is cooking some food in the kitchen at present. She always (cook) cooks  in the morning.

Miss Nguyet: Tell us about yourself Duy 

Duy: Sure I live near here now.This is my new school.Wow! It (have) is having a large playground

Miss Nguyet: Do you have (have)any new friends?

Duy: Yes,I love (love) my new school andmy new friends,Vy and Phong

Miss Nguyet: Does Vy walk (walk)to school with you?

Duy: Well,we often ride (ride)our bicycles to school.

Miss Nguyet: Who is your teacher?

Duy: My teacher is Mr Quang.He great.He teaches (teach) me English.

Miss Nguyet: What do you do usually do at break time?

Duy: I play football but my friend Phong doesn't play (not play) football. He reads (read) in the libraly.

Miss Nguyet: Wha time do you go home?

Duy: I go (go) home at 4:00 every day.Then I do my homewok

Miss Nguyet: Thanks

Guitar is a musical instrument.

Bài 5:

a) Muốn x là 1 số hữu tỉ thì \(b-15\ne0\) hay \(b\ne15\)

b)  Muốn x là 1 số hữu tỉ âm thì b - 15 < 0, tức là \(b< 15\)

c) Muốn x là 1 số hữu tỉ dương b - 15 > 0, tức là b > 15

d) Muốn x = -1 thì b - 15 phải là số đối của 12, tức là -12

\(\Rightarrow b-15=-12\Rightarrow b=3\)

e) Muốn x > 1 thì tức là tử phải lớn hơn mẫu và mẫu dương

\(\Rightarrow0< b-15< 12\Rightarrow15< b< 27\)

f) Muốn 0 < x < 1\(\Rightarrow\begin{cases}b-15>0\\b-15>12\Rightarrow b>27\end{cases}\)

........................................................