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26 tháng 8 2018

\(64:\left(-2\right)^n=-8.\)

\(\Leftrightarrow\left(-2\right)^n=64:\left(-8\right)\)

\(\Leftrightarrow\left(-2\right)^n=-8\)

\(\Leftrightarrow\left(-2\right)^n=\left(-2\right)^3\)

\(\Leftrightarrow n=3\)

26 tháng 8 2018

1. He has been learnt a lot about life in a farm

\(\Rightarrow\)He has been learn a lot about life in a farm

3. She asked me how I learm english in my country

\(\Rightarrow\)She asked me how I learn english in my country

26 tháng 8 2018

Ab có song song với EF . Vì cạnh AB  và cạnh EF là 2 đoạn thẳng đối diện , song song vs nhau .

Mk ko chắc chắn đúng nên bạn cần lưu ý nhé .

26 tháng 8 2018

AB song song với EF

26 tháng 8 2018

chả hỉu gì cả

18 tháng 2 2021

what ?? 

1. Check your understanding: matching Complete the recommendations with a job from the box. A: Support worker B: Trainee hairdresser C: Wowee Magazine writer D: Model E: Coffee Beans café worker Recommended job 1. Nina is studying English and has her own blog. She is a very sociable person, and is interested in music and fashion. ……………………….. 2. Dave has just finished school and is looking for a full-time job. He is sociable, likes working with his hands and cares about his...
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1. Check your understanding: matching Complete the recommendations with a job from the box. A: Support worker B: Trainee hairdresser C: Wowee Magazine writer D: Model E: Coffee Beans café worker Recommended job 1. Nina is studying English and has her own blog. She is a very sociable person, and is interested in music and fashion. ……………………….. 2. Dave has just finished school and is looking for a full-time job. He is sociable, likes working with his hands and cares about his appearance. ……………………….. 3. Dewei enjoys helping people. He wants to make a difference to other people's lives. He is looking for opportunities to learn new things that will help him in his career. ……………………….. 4. Sarah is a student and she is looking for flexible, part-time work. She doesn't want to work in a restaurant or shop. She is tall, beautiful and has her own unique look. ……………………….. 5. Sam is friendly and sociable. He has experience working in a restaurant and wants a job with more responsibility. He is studying part time so he needs flexible working hours. ……………………….. 2. Check your understanding: gap fill Complete the sentences with A, B, C, D or E. You can use each letter more than once. 1. You never have to wear your own clothes for job ________. 2. Job ________ offers possibilities for children under 16 years old. 3. Your pay for job ________ depends on how successful you are at the job. 4. Job ________ requires physical contact with customers. 5. Job ________ offers management opportunities. 6. You might get some "freebies" if you do job ________. 7. You need to work closely with your team for job ________. 8. Job ________ is for someone who likes working with older people.

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26 tháng 8 2018

\(A=\left(\frac{1}{2^2}-1\right)\left(\frac{1}{3^2}-1\right)...\left(\frac{1}{100^2-1}\right)\)

\(-A=\left(1-\frac{1}{2^2}\right)\left(1-\frac{1}{3^2}\right)...\left(1-\frac{1}{100^2}\right)\)

\(-A=\frac{3}{4}\cdot\frac{8}{9}\cdot...\cdot\frac{9999}{10000}\)

\(-A=\frac{\left(1\cdot3\right)\left(2\cdot4\right)...\left(99\cdot101\right)}{\left(2\cdot2\right)\left(3\cdot3\right)...\left(100\cdot100\right)}\)

\(-A=\frac{\left(1\cdot2\cdot...\cdot99\right)\left(3\cdot4\cdot...101\right)}{\left(2\cdot3\cdot...\cdot100\right)\left(2\cdot3\cdot...\cdot100\right)}\)

\(-A=\frac{1\cdot101}{100\cdot2}\)

\(-A=\frac{101}{200}\)

\(A=\frac{-101}{200}\)

26 tháng 8 2018

\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)

\(=3-\frac{1}{4}+\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)

\(=\left(3-6-5\right)+\left(\frac{-1}{4}+\frac{7}{4}-\frac{3}{2}\right)+\left(\frac{2}{3}-\frac{1}{3}\right)+\frac{6}{5}\)

\(=-8-3+\frac{1}{3}+\frac{6}{5}\)

\(=-11+\frac{7}{5}\)

\(=-11\frac{7}{5}\)