1. Every moring, my father (have) __has______ a cup of coffee but today he (drink) _drinks______ milk

2. At the moment, I (read) __am reading_______ a book and my brother (watch) _is watching_______ TV

3. Hoa (live) lives______ in Hanoi, and Ha (live) __lives_____ in HCM City.

4. Hung and his friend (play) _play____ badminton

5. They usually (get up) _____get up_______ at 6.00 in the morning.

6. Ha never (go) _goes_____ fishing in the winter but she always (do) _does______ it in the summer.

7.My teacher (tell) _tells______ Hoa about Math.

8. There (be) _are_______ animals in the circus.

9. __What__does_____ he (watch) __watch_____ TV at 7.00 every morning ?

10. What __does______ she (do) _do____ at 7.00 a.m ?

11. How old _is_____ she ?

12. How __is_____ she ?

13. MY children (go) _goes______ to school by bike 

14. We (go) _go______ to supermarket to buy some food.

15. Mr.Hien (go) _goes_____ on business to Hanoi every month

16. Ha () ___s___ coffee very much, but I (not ) _don't _____ it

17. She () _s____ Tea, but she (not ) _don't ______ coffee

18. I (love) _love_____ cats, but I ( not love) _don't love______ dogs

19. Everyday, I (go) _go_____ to school on foot, but today I (go) _go_____ to school by bike

20. Who do you ( wait) _wait____ for Nam?

- No, I (wait) _wait______ for Mr.Hai

Cảm ơn cậu nhé

Gọi chiều dài là a (m) ; chiều rộng là b(m)

Ta có : Nửa chu vi hình chữ nhật là : 150 : 2 = 75 m 

=> a + b = 75 (1)

mà 3 x a = 2 x b

Lấy (1) nhân 3 theo vế ta có : 

3 x (a + b) = 3 x 75

=> 3 x a + 3 x b = 225

=> 2 x b + 3 x b = 225 (Vì 3 x a = 2 x b)

=> 5 x b = 225

=> b = 45 

=> a = 75 - 45 = 30 

Vậy chiều dài dài 30 m ; chiều rộng dài 45 m ???

=> S = 30 x 45 = 1350 m²

Thể tích của bể là : 2 x 1,5 x 1 = 3 m³

Thời gian để bể đầy nước là : 3 : 0,5 = 6 giờ

Thể tích bể nước là 

 \(V=2\times1,5\times1=3\left(m^3\right)\)

Thời gian bể đầy nước là:

     \(3\div0,5=6\)(giờ)

a) \(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)

 0,5 x + 0,6 ( x - 2 ) = 3

0,5 x + 0.6 x - 1,2 = 3

1,1 x = 4,2

x = \(\frac{42}{11}\)

Kết luận: 

b) \(\frac{1}{3}x-0,5x=0,75\)

\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)

\(-\frac{1}{6}x=\frac{3}{4}\)

\(x=-\frac{9}{2}\)

Kết luận: 

c) \(\frac{3}{-2}x-0,5x=75\%\)

-1,5x - 0,5x = 0,75 

-2x = 0,75 

x = -0,375

Kết luận: 

d) \(-\frac{2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)

-0,4 x + 0,25 = 0,75 - 0,75 x 

-0,4 x + 0,75 x = 0,75 - 0,25

0,35 x = 0,5 

x = \(\frac{10}{7}\)

Kết luận: 

\(a,\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)

\(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)

\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)

\(\frac{11}{10}x-\frac{6}{5}=3\)

\(\frac{11}{10}x=\frac{21}{5}\)

\(x=\frac{42}{11}\)

\(b,\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)

\(\left(\frac{1}{3}-\frac{1}{2}\right)x=\frac{3}{4}\)

\(\frac{-1}{6}x=\frac{3}{4}\)

\(x=\frac{-9}{2}\)

\(c,\frac{3}{-2}x-\frac{1}{2}x=75\%\)

\(\left(\frac{3}{-2}-\frac{1}{2}\right)x=\frac{3}{4}\)

\(-2x=\frac{3}{4}\)

\(x=\frac{-3}{8}\)

\(\frac{-2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)

\(\frac{-2}{5}x+\frac{3}{4}x=\frac{3}{4}-\frac{1}{4}\)

\(\left(\frac{-2}{5}+\frac{3}{4}\right)x=\frac{1}{2}\)

\(\frac{7}{20}x=\frac{1}{2}\)

\(x=\frac{10}{7}\)

\(A=\frac{23n+1}{n-2}=\frac{23n-46+46+1}{n-2}=\frac{23\left(n-2\right)+47}{n-2}=23+\frac{47}{n-2}\)

A là số nguyên <=> \(\frac{47}{n-2}\) là số nguyên <=> \(47⋮n-2\) hay \(n-2\inƯ\left(47\right)=\left\{-47;-1;1;47\right\}\)

<=> \(n\in\left\{-45;1;3;49\right\}\)

Kết luận:...

\(A=\frac{23n+1}{n-2}=\frac{23\left(n-2\right)+47}{n-2}=23+\frac{47}{n-2}\)

A nguyên <=> \(\frac{47}{n-2}\)nguyên

=> \(47⋮n-2\)=> \(n-2\inƯ\left(47\right)=\left\{\pm1;\pm47\right\}\)