Tìm ba cách viết số hữu tỉ  - 11 25  dưới dạng tổng của hai số hữu tỉ âm.

2500 duyet di

mình chỉ làm ddcj phần a thôi 

Để (x-7)(x+3)=0 thì

x-7=0 hoặc x+3=0 

suy ra: x=7 hoặc x=3

nên đễ(x-7)(x-3)<0 thì x<3

ủng hộ nha

The some rules for pedestrians: always look carefully where you go, walk across the street at the zebra crossing, wear white or light-coloured clothes in the dark, use the pavement or footpath, wait for the trafic light to turn green before you cross the street.

The some rules for drivers: always fasten your seatbelt when you drive, don't drive if you feel tired or after you drink alcohol, don't park in front of a zebra crossing, strictly obey traffic signals.

The some rules for cyclists and motorist: always keep both hands on the handle bars, always wear a helmet when you ride a motorbike, give a signal before you turn left or right, use front and back lights at night, don't carry a passenger in front of you.

Tiền bán bằng : 60 000 : 50 000 = 1,2 = 120 % ( tiền vốn )

Vậy người đó lãi : 120%  - 100% = 20 % ( tiền vốn )

đáp số : 20 %

The move to a different environment had brought about a significant______in Mary’s state of mind.

A. impact

B. effect

C. influence 

D. change

3. Talk about what do you do to stay healthy

They have many kind of health problems such as flu, allergy, spots,... I sometime have these problems but now my health is very well because I often do more exercise, I eat more fruit and vegetables but I eat less junk food and fast food, wash my hand regularly.

1. Talk about your hobby

I have many hobbies I like to do in my free time but reading books is the one I like best. I started reading book when I was 10 years old. I often share with my mother and my friends. To read books well, I practise reading many kinds of book everyday and I collect books whenever I have chance. I find this hobby interesting. I think I will make my collection of book richer and richer