Cho biểu thức: B= $\frac{x^2+2x}{2x+10}$ +$\frac{x-5}{x}$ +$\frac{50-5x}{2x.(x+5)}$ Tìm x để B>0; B<0; B=0; B=$\frac{1}{4}$

Vẽ Doraemon nha !!!!!!!!!!! ( cảm ơn + vote 5 *)

Lm hộ mik bài này với Tks nha

bài 1: a: (x+1)+(x+2)+(x+3)+.....+(x+100)=5350

1)Tính 3/5+3/4÷4/7 1/2+1/3+1/15 1/2-1/4+1/6 7/3+4/3-2/7 2/5+1/15+3/10 25/27+3/7+4/7+2/27 6 1/5×1 2/3÷2

4. After the 3 days of rain. I am glad that the sun (shine) ____ again today. 5.I am tired. After I (get ) home. I (take) a hot shower and (go) to bed 6. you (want) to shipping with me? I ( go) the shopping mall downtown 7.Now, I (understand) what you are trying to say with me 8. I(come) to visit my grandmother. She (be) ill

Vẽ cho mk anime nữ ôm gấu bông đẹp vào nha Bạn nào có tâm thì tô màu luôn Tranh mới nha ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ngoài lề: Cho mk hỏi tộc Alone là gì vậy??? Mong Mod không xóa

có bao nhiêu phát biểu sau đây là đúng khi nói về quá trình phiên mã 1. 1 đoạn adn tương ứng với 1gen sẽ đc tháo xoắn 2. quá trình tổng hợp arn sẽ đc thục hiện trên 1 mạch của gen 3. nhiều phân tử arn có thể đc tổng hợp cùng 1 gen 4. sau khi tổng hợp arn đoạn adn đc đóng xoắn lại A. 1 B.2 C.3 D.4

Hãy giải thích tại sao pha đèn pin, ô tô hay xe máy lại dùng gương cầu lõm chứ không dùng gương phẳng hay gương cầu lồi ?

Complete these sentences with the correct word “for”, “during”, “while” or “meanwhile”. 49. He’s been on holiday ............................ three weeks. 50. ............................ that time, he’s visited his relatives in Australia. 51. ............................, I’ve been doing his work. 52. ............................ he has been on holiday, I’ve been doing his work. 53. I’ve been doing his work ............................ the time he has been away. 54. The crisis arose ......................... the Managing Director was on holiday and lasted ......................... the duration of his absence. 55. The crisis arose ......................... the Managing Director’s absence on holiday. He went to sea ............................ a few days in his yacht; ............................, his colleagues were attempting to resolve the problems without him because they were unwilling to disturb him ............................ he was away. 56. When he returned, he was very angry. ‘Good heavens,’ he said. ‘I’ve only been away ............................ a fortnight but ............................ my absence, everything seems to have gone to pieces. There I was, sailing peacefully around the Mediterranean, and ............................, ............................ the time I was away, you were trying to solve these problems without telling me.’