Ai giúp mình đi, Ngày mai mình thi câu này rồi mà k hiểu
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a: Xét ΔADB và ΔADC có
AD chung
DB=DC
AB=AC
Do đó: ΔADB=ΔADC
b: Ta có: ΔABC cân tại A
mà AD là đường trung tuyến
nên AD là phân giác
c: Xét ΔAED vuông tại E và ΔAFD vuông tại F có
AD chung
\(\widehat{EAD}=\widehat{FAD}\)
Do đó: ΔAED=ΔAFD
Suy ra: DE=DF
6853 + 3153 = ( 685 + 315 ) . ( 8652 + 685 . 315 + 3152 ) = 1 000.
Vì các số hạng trong ngoặc đều chia hết cho 25 nên 8653 + 3153 chia hết cho 25 000.
mình viết theo gia đình mình nha!!!!
This is my family. There are four people in my family: mother, father, sister and me, My father name is ( tên ). My father is 45 years old. My father is a ( nghề nghiệp). My mother name is ( tên ). My mother is 40 years old. She is a teacher. My sister name is Linh. My sister is 16 years old. She is a student. My name is ( tên). I am is 12 years old. I am is a student.
tick nha!!!!!!!!!!!!!!!!!
Đây:
I love my family a lot because it's my home. In my family, there are four people: my father;my mother ;my younger brother and me. My father is a police.He is 40 years old and He works at the police station.He's tall and fat. He's very strict. My mother is 35 years old. She is a good teacher at Binh Son high school. She'is caring and friendly. She cooks very well.My younger brother is a pupil of Chau O primary school. He is very chubby. And me, I am a student in grade 6, class 6c at Nguyen Tu Tan secondary school. My hobby is reading English books because I can improve my vocabularies and structures ( cấu trúc). I am sociable and humorous. I love my family very much.