Làm vào giúp mình giải thích và dịch ra với ạ

mọi người giúp mình với cần câu b và c ạ

Giúp e với các ac ơi E sẽ đánh giá 5* và cho ctlhn ạ

Tính theo cách hợp lí nhất a)50*113+14*113+36*113 b)1875:2+125:2 c)14*72*25 ───── 21*100*9

Tại sao chúng ta có những vết thương lõm sau 1 thời gian thì chúng lại lồi lên?

Giải thích vì sao khi tưới nước hoặc mưa lâu ngày, cây vẫn phát triển tốt?

Vẽ sơ đồ cách mạng tư sản Anh giúp mình với mình cảm ơn ạ

4. We need to spend less time _______ computer games. A. play B. to play C. playing D. to playing 11. We should play sports or do exercise in order to stay in _________. A. look B. shape C. fit D. health 15. Be careful with _________ you eat and drink. A. what B. that C. who D. this

2. Since 2006, she hasn’t corresponded with Maryam. She last________________________________________________________ 3. My mother stopped dancing when she was 35. My mother hasn’t________________________________________________________ 4. It’s been 20 years since we last saw each other. We haven’t________________________________________________________ 5. The last time they played tennis was on July, 31st, 1989. They have________________________________________________________ 6. Did you start to design these baggy pants at 8 o’clock? Have you ________________________________________________________ 7. How long have you learned Japanese? When did________________________________________________________ 8. I have never seen such a good music band before. This is the first ……………………………………………………………. This is the best ……………………………………………………………. 9. We last saw Mary 3 months ago. We ________________________________________________________ Mary_______________________________________________________ 10. This is the first time he went abroad He hasn't............................................................................................................. 11. She started driving 1 month ago. She has................................................................................................................. 12. We began eating when it started to rain. We have................................................................................................................ 13. I last had my hair cut when I left her. I haven't................................................................................................................ 14. The last time she kissed me was 5 months ago. She hasn't............................................................................................................. 15. It is a long time since we last met. We haven't............................................................................................................. Giúp mình với ạ

chứng minh các phương trình sau vô nghiệm a, x^2 -x+1=0 b, x^2 + y^2 + 2(x-2y)+6=0 c, 2x^2 + y^2 + 2x(y-1)+2 =0