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Thùy Phạm
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HT.Phong (9A5)
7 tháng 12 2023 lúc 15:29

Bài 3:

a) \(159-\left(25-x\right)=43\)

\(\Rightarrow25-x=159-43\)

\(\Rightarrow25-x=116\)

\(\Rightarrow x=25-116\)

\(\Rightarrow x=-91\)

b) \(\left(79-x\right)-43=-\left(17-52\right)\)

\(\Rightarrow\left(79-x\right)-43=-\left(-35\right)\)

\(\Rightarrow79-x=35+43\)

\(\Rightarrow79-x=78\)

\(\Rightarrow x=79-78\)

\(\Rightarrow x=1\)

c) \(-\left(-x+13-142\right)+18=55\)

\(\Rightarrow-\left(-x+13-142\right)=55-18\)

\(\Rightarrow x-13+142=37\)

\(\Rightarrow x+129=37\)

\(\Rightarrow x=37-129\)

\(\Rightarrow x=-92\)

Phương Nguyễnnn
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Sơn Sarah
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Uyên Linh
21 tháng 6 2017 lúc 16:30

A B C H D E

??? BC rõ ràng dài hơn AH mà! Bạn xem lại đề đi!

Sơn Sarah
21 tháng 6 2017 lúc 16:40

đề nó như thế bn ơi !!

Phương
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Nguyễn Lê Phước Thịnh
5 tháng 5 2021 lúc 13:37

Gọi phương trình đường thẳng đi qua hai điểm A(1;0) và B(2;4) là (d): \(y=ax+b\left(a\ne0\right)\)

Vì \(A\in\left(d\right)\) và \(B\in\left(d\right)\) nên ta lập được hệ phương trình:

\(\left\{{}\begin{matrix}a\cdot1+b=0\\a\cdot2+b=4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a+b=0\\2a+b=4\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}-a=-4\\a+b=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=4\\b=-4\end{matrix}\right.\)

Vậy: (d): y=4x-4

Bby Min
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Nguyễn Lê Phước Thịnh
13 tháng 12 2021 lúc 17:17

Câu 4: 

a: Xét ΔMIN và ΔMIP có

MI chung

IN=IP

MN=MP

Do đó: ΔMIN=ΔMIP

Phương Linh
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Phạm Bình Minh
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Nguyễn Thanh Huyền
1 tháng 10 2017 lúc 23:10

Bn nhờ thầy đổi tên cho

băng châu
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Nguyễn Lê Phước Thịnh
9 tháng 11 2021 lúc 21:07

a: Xét (O) có 

ΔABC nội tiếp đường tròn

AB là đường kính

Do đó: ΔABC vuông tại C

minh thao tran
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Cá Biển
26 tháng 10 2021 lúc 19:38

Tham khảo!
There are many advantages and disadvantages of choosing to live in the country or to live in the city. But the advantages of living in the country definitely outweigh the advantages of living in the city.
In the city, public schools are often packed full of students resulting in larger class sizes and no real teacher student relationship. You would be lucky if your teacher could put a name to your face. Though, bigger schools in the city offer more courses for the student to take and also offer more extracurricular activities. Where in the country, public schools often do not have many students making class sizes significantly smaller resulting in a better teacher student relationship. Your teacher usually knows you by first and last name, and chances are, your teacher had a few of your family members as students. Though these things are advantages, school in rural areas generally do not offer as many courses and also do not have as many extracurricular activities to be involved in, limiting the students to fewer opportunities.
There are a lot of activities to do in the city. There are more movie theaters, concerts, professional sporting events, zoos, shopping malls, restaurants and museums. But the activities you can do in the country are a lot more fun. In the country, activities consist of, four wheeling, boating, horseback riding, camping, having bon fires, taking walks in the woods and having back yard barbeques.
Transportation is very accessible in the city. Public transportation, by way of subways, busses, trams and ferries are easy and cheap ways of getting around. But the streets are also very crowded. Whereas owning your own vehicle is a must if you live in the country. Which, when added to the cost of insurance, gas and the time of commuting, can end up being a very large expense. But, with the roads being less crowded, it is a much more peaceful way to travel.
Some may believe that you have to...