b) Ta có: \(Q=\dfrac{\left(29\cdot3+29\cdot5\right)}{212}\)

\(=\dfrac{29\cdot\left(3+5\right)}{212}\)

\(=\dfrac{29\cdot8}{212}=\dfrac{58}{53}\)

\(=\dfrac{5\cdot2^{18}\cdot3^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-1\right)}{2^{28}\cdot3^{18}\left(5-7\cdot2\right)}=\dfrac{2\cdot9}{-9}=-2\)

easy
 

bạn ơi cái dấu ơ trên đầu là cái dấu gì vậy 

là phân số

là dấu chia thật là trên

làm thì đúng nhưng ngu quá

ai nhanh tick

Exercise 4: Choose the correct form.

27.1. Our dog is amazing - it __________ sing!

a. should

b. must

c. can

d. might

28.2. Bring your umbrella - it __________ rain later.

a. can

b. might

c. must

d. should

29.3. All students __________ wear their uniforms to school.

a. should

b. will

c. may

d. must

30.4. We __________ wash our hands before we have our meals.

a. could

b. can

c. should

d. might

31.5. __________ we go to the beach today? ~ Great!

a. Shall  

b. Will

c. Might

d. Should

32.6. Students __________ use a dictionary during the test. It’s forbidden.

a. can’t

b. mustn’t

c. might not

d. won’t

33.7. I __________ go to the football match but I don’t know yet.

a. can’t

b. shouldn’t

c. might not

d. mustn’t

34.8. Ingrid __________ play the violin when she was six.

a. can’t

b. could

c. might

d. shouldn’t

35.9. __________ you like something to drink?

a. Could

b. Should

c. Will

d. Would

36.10. I’m afraid of water because I __________ swim.

a. can’t

b. may

c. couldn’t

d. must

Exercise 4: Choose the correct form.

27.1. Our dog is amazing - it __________ sing!

a. should

b. must

c. can

d. might

28.2. Bring your umbrella - it __________ rain later.

a. can

b. might

c. must

d. should

29.3. All students __________ wear their uniforms to school.

a. should

b. will

c. may

d. must

30.4. We __________ wash our hands before we have our meals.

a. could

b. can

c. should

d. might

31.5. __________ we go to the beach today? ~ Great!

a. Shall  

b. Will

c. Might

d. Should

32.6. Students __________ use a dictionary during the test. It’s forbidden.

a. can’t

b. mustn’t

c. might not

d. won’t

33.7. I __________ go to the football match but I don’t know yet.

a. can’t

b. shouldn’t

c. might not

d. mustn’t

34.8. Ingrid __________ play the violin when she was six.

a. can’t

b. could

c. might

d. shouldn’t

35.9. __________ you like something to drink?

a. Could

b. Should

c. Will

d. Would

36.10. I’m afraid of water because I __________ swim.

a. can’t

b. may

c. couldn’t

d. must

\(29.3+29.5+\left(-29\right).2=29.\left(3+5+-2\right)=29.6=174\)

\(29.3+29.5+\left(-29\right).2\\ =29.3+29.5+29.\left(-2\right)\\ =29.\left(3+5-2\right)\\ =29.6\\ =174\)

\(29.3+29.5+\left(-29\right).2\)

\(=29\left(3+5-2\right)\)

\(=29.6\)

\(=174\)

1.She (not/be).........wasn't.............interested in the book because she didn't understand it.

2.My sister(work)..........has worked............as a business woman since she (be)......was.........29.

3.-(You/watch)........Did you watch................the football match on TV last night?

-Yes,I (do)..........did.........It (be)......was.............very exciting

4.(Lan/sometimes/walk)..............Does Lan sometimes walk........................to school?

5.Right now,Tom(work)..........is working......in his office .He (often/work)...........often works...........at this time.

6.-How long (he/work)......has he been working.................in this company?

-He (work)..........has worked............here for 3 months

7.My father (already/buy)....................has already bought.........that car

8.This is the second time Tom(meet)............has met.........his uncle

9.Their parents (go)..............went...........out for dinner last night

10.My grandfather (live).......has been living.........in HCM city for ten years.

11.(Lan /borrow).........Has Lan borrowed....................some books from the library since Monday?

12.They (leave).........left............Ha Noi for HCM city yesterday