Giúp mk 28 29 30 31 32 với ạ :(

2+-3+4+-5+...+2008+-2009+2010+-2011+2013

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Giúp em với ạ em cảm ơn nhiều ạ

Cho ctlhn cho ai trả lời đc Cho biểu thức A=(x+2/x-1- 2x^2+1/x^2-x) : x+2/x với x khác 0, x khác 1, x khác -2 a, CMR A= 1-x/x+2 b, Tính giá trị của A , biết x thỏa mãn x^2 - 3x=0

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VII. Choose the best answer to rewrite the sentences. 33. Her brother went to school by bus, but now he uses his car. A. Her brother goes to school by bus. B. Her brother used to go to school by car. C. Her brother used to drive to school by his car. D. Her brother used to go to school by bus. 34. I want to see the horror film, but I don’t have free time. A. If I have free time, I will see the horror film. B. I will not see the horror film when I have free time. C. When I have free time, I will not see the horror film. D. I will not see the horror film if I have free time. 35. He often spends 20 minutes driving to his hometown. A. It takes 20 minutes driving to his hometown by him. B. It takes 20 minutes of him to drive to his hometown. C. It takes him 20 minutes to drive to his hometown. D. It takes 20 minutes of him driving to his hometown. 36. The comedy is so funny that we laugh all the morning. A. The comedy makes us laugh all the morning B. We laugh all the morning because of the funny comedy. C. We laugh all the morning because the comedy is so funny. D. All are correct. 37. There weren’t many international schools 10 years ago. A. There used to be many international schools 10 years ago. B. There didn’t used to be many international schools 10 years ago. C. There didn’t use to be many international schools 10 years ago. D. 10 years ago, there wasn’t many international schools. giúp mình với ạ

Một ô tô đi từ A đến B với vận tốc đã định và thời gian dự định. Nếu vận tốc tăng 20 km/giờ thì ô tô đến B sớm hơn dự định 1 giờ. Nếu vận tốc giảm bớt đi 10 km/giờ thì ô đến B chậm so với dự định 1 giờ. Tính độ dài quãng đường AB.

Tính GTBT a) 5/11.18/29-5/11:29/8+19/29:11/5