Chọn D

mình cũng sắp thi HSG Vật Lý nè :((

me too

Unit 11. What’s the matter with you?
Read and match:
What’s the matter with you?
She shouldn’t eat a lot of sweets.


Nam has a toothache.
I have a headache.


Phong has a fever.
She shouldn’t carry heavy things.


Mai has a stomach ache
He should go to the dentist.


Quan’s grandmother has a backache.
He should stay in bed.


Miss Hien has a sore throat.
She should take a rest.


My mother has a headache.
He shouldn’t watch much TV.


His brother has sore eyes.
She should take some warm water.


Put the words in order to make sentences:
What’s /your /the /with/ matter/ mother/?
I/ a /throat/ sore /have/.
eat /I /speak /can/ not/ or/.
You /doctor/ should/ to/ the /go/.
Eat/ You /shouldn’t /ice-cream.
to /should/ go /the/ He /dentist/.
Should/ Mr. Tuan/ a/ take /rest/.
He / heavy /carry /shouldn’t/ things/.
had /Quan /to /the/ headache/ doctor/ because/ went/ he /a/.

school / Mai / bad /come/ to /can’t /because/ she/ cold /has/ a/.

well/ I /feel /don’t/. 
I /get/ you/ will /well /hope/ soon/.
My /backache /has/ grandfather /a/.
I’m /health /sorry /to /about/ hear/ very/ your/.
What’s/ your /the /with /matter /sister/?
VI. Find the odd one out:
1. a. cough b. weak c. headache d. sore throat
2. a. sunburn b. toothache c. earache d. unhealthy
3. a. sick b. temperature c. tired d. weak
4. a. flu b. stomachache c. cold d. fat


5. a. sleep b. happy c. live d. smile
6. a. feel b. healthy c. well d. tired 
7. a. fat b. big c. matter d. small
8. a. fever b. dentist c. nurse d. doctor
VII. Find and correct the mistake:
Last week my family move for a new house.
What’s the matter of you, Lan?
Don’t stay up so early, it’s bad for your health.
He has strong white teeth because he brush his teeth regularly.
She should goes to bed early.
My father have a sore throat.
What didn’t Nam go to school yesterday?
Where are you yesterday?
We are going to visited our teachers.
She can’t speak because she has an sore throat.
Ex 3: Read and write 
I have a pain in my teeth. I have a…………….
Tony has a high temperature. He has a……………….
Mai has a pain in her throat. She has a………………..
I have a pain in my back. I have a…………………….
Thu has a pain in her stomach. She has a…………….
My father has a pain in his ear. He has a……………..
He is cold. He has a ……………………………………
I broke my arm. I have a…………………………..
Ex 5: Giving advice by using “ should” or “shouldn’t”
stay up late, drink coffee, do morning exercises regularly, take a hot bath, go to bed early, eat a lot of fruits and vegetables, take some aspirins, see the doctor, drink hot water, brush your teeth twice a day, eat healthy foods, keep your nails short and clean, wash your hands before having meals, see the dentist, eat many candies, drink cold water, eat too much, 



Should
Shouldn’t

Tony has a bad toothache.




Quan has a bad cold.




Phong has a stomachache.





Phong has a sore throat. 




Unit 12: Don’t ride your bike too fast
Matching
1.Don’t play with the knife
a.Because you may fall.

2.Where are you, Tom?
b. I’m cooking some rice.

3.Don’t touch the stove

Vì UCLN(a,b)=30 nên ta đặt a=30c, b=30d (c,d thuộc N và c<d,UCLN(c, d) =1)

Ta có a+b=30c+30d=240=>c+d=8.

Vì UCLN(c,d)= 1 và c<d nên ta có 2 trường hợp :

c=7, d=1 suy ra a=210, b=30

c=5, d=3 suy ra a=150, b=90.

Chúc bạn học tốt!

Kb vs mình nha

thể tích là

50x15x40=3000(dm3)

3000dm3=3m3=3 khối

     Đ/S:3 khối cát

là 30000 dm3 = 3 khối cát mới đúng mình làm nhầm sorry

đầu bài sai hay sao ý

Toán lớp 3 như lớp 5

đúng mà, toán lớp 3 chuẩn rồi. Chỉ là hơi nhiều thôi.

1224745.852941176 mà hơi khó nhỉ

 

2)\(\dfrac{x+5}{3x-6}-\dfrac{1}{2}=\dfrac{2x-3}{2x-4}\)

⇔\(\dfrac{x+5}{3\left(x-2\right)}-\dfrac{1}{2}=\dfrac{2x-3}{2\left(x-2\right)}\)

⇔\(\dfrac{2\left(x+5\right)}{3.2\left(x-2\right)}-\dfrac{3\left(x-2\right)}{2.3\left(x-2\right)}=\dfrac{3\left(2x-3\right)}{2.3\left(x-2\right)}\)

⇔\(\dfrac{2x+10}{6\left(x-2\right)}-\dfrac{3x-6}{6\left(x-2\right)}=\dfrac{6x-9}{6\left(x-2\right)}\)

⇔\(2x+10-\left(3x-6\right)=6x-9\)

⇔\(2x+10-3x+6-6x+9=0\)

⇔\(-7x+25=0\)

⇔\(-7x=-25\)

⇔\(x=\dfrac{25}{7}\)

3)\(\dfrac{1}{x-1}-\dfrac{3x^2}{x^3-1}=\dfrac{2x}{x^2+x+1}\)

⇔\(\dfrac{1}{x-1}-\dfrac{3x^2}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{2x}{x^2+x+1}\)

⇔\(\dfrac{x^2+x+1}{\left(x-1\right)\left(x^2+x+1\right)}-\dfrac{3x^2}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{2x\left(x-1\right)}{\left(x-1\right)\left(x^2+x+1\right)}\)

⇔\(x^2+x+1-3x^2=2x^2-2x\)

⇔\(x^2+x+1-3x^2-2x^2+2x=0\)

⇔\(-4x^2+3x+1=0\)

⇔\(-\left(4x^2-3x-1\right)=0\)

⇔\(-\left(4x^2-4x+x-1\right)=0\)

⇔\(-\left[\left(4x^2-4x\right)+\left(x-1\right)\right]=0\)

⇔\(-\left[4x\left(x-1\right)+\left(x-1\right)\right]=0\)

⇔\(-\left[\left(x-1\right)\left(4x+1\right)\right]=0\)

⇔\(-\left(x-1\right)=0\) hay \(-\left(4x+1\right)=0\)

⇔\(-x+1=0\) hay \(-4x-1=0\)

⇔\(-x=-1\) hay \(-4x=1\)

⇔\(x=1\) hay \(x=-\dfrac{1}{4}\)

Do dien