Em lớp 4 thôi chụy ơi! Với lại nhà em không nuôi gấu nên em không tả được

dua ak

tui hong nuoi gau

12h hả chị?

Không mất tính tổng quát

g/s: BH=9m , CH=16m
Ta có: BC=BH+HC=25m

Xét tam giác ABC vuông tại A

=> \(AB^2+AC^2=BC^2=625\)

Xét tam giác ABH và ACH vuông tại H có: \(AB^2=AH^2+BH^2=AC^2-CH^2+BH^2\)=> \(AB^2=AC^2-16^2+9^2=AC^2-175\)

=> \(AC^2-175+AC^2=625\Rightarrow AC^2=400\Rightarrow AC=20\)m

=> \(AB^2=AC^2-175=225\Rightarrow AC=15\)m

Chu vi= 15+20+25=60 m

Câu hỏi của Nguyễn Hiền Thục - Toán lớp 6 - Học toán với OnlineMath

Bạn tham khảo.

\(\left(3x-1\right)\left(x^2+2\right)=\left(3x-1\right)\left(7x-10\right)\)

\(\Leftrightarrow\left(3x-1\right)\left(x^2+2\right)-\left(3x-1\right)\left(7x-10\right)=0\)

\(\Leftrightarrow\left(3x-1\right)\left(x^2+2-7x+10\right)=0\)

\(\Leftrightarrow\left(3x-1\right)\left(x^2-7x+12\right)=0\)

\(\Leftrightarrow\left(3x-1\right)\left(x^2-4x-3x+12\right)=0\)

\(\Leftrightarrow\left(3x-1\right)[x\left(x-4\right)-3\left(x-4\right)]=0\)

\(\Leftrightarrow\left(3x-1\right)\left(x-4\right)\left(x-3\right)=0\)

Tương đương với 1 trong 3 biểu thức trên bằng 0.

Giải ra 3 nghiệm là \(x=\frac{1}{3};x=4;x=3\)

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from hà nội nào

Louis Armstrong Louis Armstrong, who  ...........(1).............born in 1890 and .........(2).............. in 1971, was a very famous jazz musician. He used to be known as “ Satchmo” and this nickname stayed with him all his ..........(3).............  . As a child in New Orleans, he learnt to  ..............(4)................the trumpet while he was living in a special home for children who had got into trouble with the police. When he had finished his stay in the home, he joined various bands and then he formed his own. Between 1925 ……(5) ….......................1928 he made about 60 records. These records made him one of the first solo stars in the history of pop ..........(6)......... When he died, he had been making records and he had been touring all over the .............(7)................for more than forty years, and he was  just as popular  ................(8)...................  he had been before. He even  .......(9).................. a number one pop record  - What A Wonderful World – ……(10) .................  the 1960s.    
      Your answers:    

    1. was          2. died            3. life                     4. play                    5.and   

       6. music          7. world                8. as                 9. had              10:in

1. was

2. died

3. life

4. play

5. and

6. music

7. world

8. as

9. had

10. in