Tỉ lệ \(x=\dfrac{y}{-5}\)

x             -4                 -1                2                   3

y             20                 5               -10               -15

e ko thich doc sach

ko chép mạng ;-;

ko chép mạng ????

Câu A nha em

xót xa, đường sá

dòng thứ nhất iem ưi

a, có 3 điểm A B O

b,có

c,có

Thế nha bạn

Refer:

Last summer I had the opportunity to go to Phu Quoc. This is one of the great tourist destinations that I have been to. Phu Quoc is an island district. There are large islands here and many other small islands. I departed for Phu Quoc by plane. I booked a room at a hotel near the sea. Here I can watch the sunrise. The climate here is cool. The air is very fresh. I swim with my friends. Phu Quoc has many different beaches. If you have time, you can experience each place. The clear blue sea and fine sand are the attraction of Phu Quoc, not everywhere. There are many places to check in here. I took a lot of photos to make memories. Phu Quoc fish sauce is one of the specialties that many tourists buy as gifts for relatives and friends. Because my time was limited, I stayed in Phu Quoc not long. I think I’ll be back here this summer.

sgk à

0 dc đăng đề dạng ảnh

bạn chép lại đề rõ hơn đc ko

Tam giác ABC vuông tại A có AM là trung tuyến ứng với cạnh huyền

\(\Rightarrow AM=\dfrac{1}{2}BC\Rightarrow BC=2AM=50\left(m\right)\)

a. Áp dụng định lý Pitago:

\(AB=\sqrt{BC^2-AC^2}=30\left(m\right)\)

b. Kẻ \(MH\perp AC\Rightarrow MH||AB\) (cùng vuông góc AC)

Mà M là trung điểm BC \(\Rightarrow MH\) là đường trung bình tam giác ABC

\(\Rightarrow MH=\dfrac{1}{2}AB=15\left(m\right)\)

\(\Rightarrow S_{AMC}=\dfrac{1}{2}MH.AC=\dfrac{1}{2}.15.40=300\left(m^2\right)\)