Trả lời 15.1 , 15.2 và 15.6 giúp

3x +11y = 14 căn 3 + 8 và(1+ căn 3) x+ 2căn 3y = 2căn3 + 8. Giải giúp mik với ạ, thx trước

a) $\frac{x}{2012}$+ $\frac{x+1}{2013}$ +$\frac{x+2}{2014}$+ $\frac{x+3}{2015}$+ $\frac{x+4}{2016}$ =5 b)x $\frac{x-90}{10}$ +$\frac{x-76}{12}$+ $\frac{x-58}{14}$+ $\frac{x-36}{16}$+ $\frac{x-15}{17}$=15 c) $\frac{x^2-10x-29}{1971}$ + $\frac{x^2-10x-27}{1973}$ =$\frac{x^2-10x-1971}{29}$ +$\frac{x^2-10x-1073}{27}$ Giải các PT trên

vì sao nói công nghiệp điện tử - tin học ít gây ô nhiễm môi trường, tiêu thụ ít tài nguyên?

Một mảnh đất hình chữ nhật có chu vi là 90m. Nếu giảm chiều dài 5m và chiều rộng 2m thì diện tích giảm 140 mét vuông . Tính diện tích mảnh đất đó

Đề bài là chứng minh răng những sô sau bằng nhau

Theo em, tất cả những câu tục ngữ có đúng trong cuộc sống ngày nay hay không ? Nêu dẫn chứng và chứng minh cho ý kiến em đưa ra.

Giai giúp mình các câu sau. mình đang cần gấp !! :(( 1. The_________ is the air, water and land in or on which people, animals and plants live. A. consequence B. environment C. planet D. resource 2.We continue to ...... rainforests and increase the dangers of global A. cut off B. cut in C. cut out D. cut down 3. I can answer the question _________ you say is very difficult. A. which B. whom C. who D. whose 4..My friend, _________ I visited last week, is taking a holiday soon. A. that B. whom C. which D. whose 5.The doctor is examining a patient _________ was taken to hospital last night. A. which B. who C. whom D. whose 6.My friend, _________ hated horror film, refused to go to the cinema with me. A. whom B. which C. whose D. who 7. She ate an apple _________ was still green. A. who B. which C. whose D. whom 8.This is Mr. Jones, _________ invention has helped hundreds of deaf people. A. which B. that C. whose D. whom 9. She is the advisor. We got those recommendations from her. A. She is the advisor, who we got those recommendations from. B. She is the advisor whom we got those recommendations from her. C. She is the advisor from that we got those recommendations. D. She is the advisor from whom we got those recommendations. 10.That is the student . I borrowed his book last week . A. That is the student I borrowed whose book last week. B. The student whose book I borrowed that is . C. That is the student whose book I borrowed last week. D. That is the student, whose book I borrowed last week

giúp mình câu 9 với giải đầy đủ nhé mình cảm ơn

Chia động từ : My mother fancies ( cook ) ___________________