1. Muong people earn a living by farming and rising animals.

2. They are in the habit of exercising after work.

1. If you don't drink more water, you will get more acne.

2. My sister wants to see the terraced fields, so she is going to Sa Pa.

3. Unless he spend time on his phone, he will complete his work.

Xét tam giác ABC có BN, CM là 2 đường phân giác

suy ra AB/AN=BC/NC hay AC/BC=AN/NC

AC/AM=BC/MB hay AC/BC=AM/MB

Suy ra AN/NC=AM/MB

Suy ra MN//BC (THALES đảo)

suy ra MN/BC=AM/AB

Suy ra MN/AM=BC/AB=a/b (1)

ta có AM/b=BM/a=AM+BM/a+b=AB/a+b=b/a+b

suy ra AM=b^2/a+b (2)

từ (1) và (2) suy ra MN=ab/a+b