Lê Đình Hùng's Profile

Đường chéo của hình tứ giác dài 3 cm, và chiều cao của hình tam giác là 2 cm và 7 cm. Diện tích của hình tứ giác là bao nhiêu?

Nhớ ghi lời giải

My name is hung, in 2014 I was six years old and I have remembered a very important event that happened in my life. My parents decided to admit me to the nearest school. The date was 22th August 2014. I was really excited about the whole thing. I went there with both of my father and mother.

They brought me to the headmaster’s room. Later I knew that the headmaster was a friend of my father. He asked me a few basic questions about letters and poems. I learned so many poems and knew all the letters, and I answered him properly. Then I got admitted there.    

8^7-2^18=(2^3)^7-2^18
=2^21-2^18
=2^18(2^3-1)
=2^18.7
=2^17.2.7
=2^17.14 chia hết cho 14.
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