\(B=\dfrac{\dfrac{2}{10}-\dfrac{3}{8}+\dfrac{5}{11}}{\dfrac{-3}{10}+\dfrac{9}{16}-\dfrac{15}{22}}\)\(-\dfrac{1}{3}\)

\(B=\dfrac{\dfrac{2}{10}-\dfrac{6}{16}+\dfrac{10}{22}}{\dfrac{-3}{10}+\dfrac{9}{16}-\dfrac{15}{22}}\)\(-\dfrac{1}{3}\)

\(B=\dfrac{2.\left(\dfrac{1}{10}-\dfrac{3}{16}+\dfrac{5}{22}\right)}{-3.\left(\dfrac{1}{10}-\dfrac{3}{16}+\dfrac{5}{22}\right)}\)\(-\dfrac{1}{3}\)

\(B=\dfrac{-2}{3}-\dfrac{1}{3}=-1\)

6)a) \(\left|\dfrac{5}{3}:x\right|=\left|\dfrac{-1}{6}\right|\)

⇒ \(\left|\dfrac{5}{3}:x\right|=\dfrac{1}{6}\)

⇒ \(\dfrac{5}{3}:x=\dfrac{1}{6}\) hoặc \(\dfrac{5}{3}:x=\dfrac{-1}{6}\)

*TH1 : \(\dfrac{5}{3}:x=\dfrac{1}{6}\)

⇒ \(x=\dfrac{5}{3}:\dfrac{1}{6}=10\)

*TH2 : \(\dfrac{5}{3}:x=\dfrac{-1}{6}\)

⇒ \(x=\dfrac{5}{3}:\dfrac{-1}{6}=-10\)

Vậy \(x\) ∈ \(\left\{10;-10\right\}\)

\(b,\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|-\dfrac{3}{4}=\left|\dfrac{-3}{4}\right|\)

⇒ \(\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|-\dfrac{3}{4}=\dfrac{3}{4}\)

⇒\(\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|=\dfrac{3}{4}+\dfrac{3}{4}=\dfrac{3}{2}\)

⇒ \(\dfrac{3}{4}x-\dfrac{3}{4}=\dfrac{3}{2}\) hoặc \(\dfrac{3}{4}x-\dfrac{3}{4}=\dfrac{-3}{2}\)

TH1 : \(\dfrac{3}{4}x-\dfrac{3}{4}=\dfrac{3}{2}\)

⇒ \(\dfrac{3}{4}x=\dfrac{3}{2}+\dfrac{3}{4}=\dfrac{9}{4}\)

⇒\(x=\dfrac{9}{4}:\dfrac{3}{4}=3\)

TH2 : \(\dfrac{3}{4}x-\dfrac{3}{4}=\dfrac{-3}{2}\)

⇒ \(\dfrac{3}{4}x=\dfrac{-3}{2}+\dfrac{3}{4}=\dfrac{-3}{4}\)

⇒ \(x=\dfrac{-3}{4}:\dfrac{3}{4}=-1\)

Vậy \(x\) ∈ \(\left\{3;1\right\}\)

400 ĐÓ BN ƠI

180m/phút nha bạn

1. She is too young to see this film.

She is not old _______________

2. He drives carelessly, so he usually has accidents

He is such _________________

3. "Why don't we stop destroying forests ?"

I suggested _________________

4. Mr.Tam is the most careful worker in the factory

Nobody ___________________

5.Why don't you give up smoking ?

If ____________

6. It's ages since we last met him

We haven't ____________

7.She'd better improve her English

I suggest _____________

8. " I'm sorry . I'm late, " I said to him

I apologized _____________

9. The room is too old to be used

The room needs ____________
10. It takes us only five minutes to brush teeth every morning .

We spend _________________

11. I wrote this book in three weeks

It took ________________

12.She can't afford to go on holiday

She hasn't got _____________

13. They missed the flight

When they ______________

14. We wished we hadn't bought this house.

We regretted ______________

15.You will catch a cold if you don't keep your feet dry.

Unless ______________

16.He mended the washing machine for me.

I had the ____________

17. He is such a slow speaker that we get bored

He speaks __________

18.He said that he didn't steal your pen

He denied _______________

19. Because I don't know Japanese, I can't apply for the position

If I knew __________________

20. It's ages since they heard from her

They ______________________

21.Although they weren't experienced, they got the job.

Despite the ________________
22. She doesn't play tennis as well as she used to

She used ___________________

Tàu hỏa đên ga Lào Cai lúc 3 giờ 45 phút  sáng ngày 1 tháng 5. Trờiơi sao bon nó ra câu hỏi mà kết quả đúng là ngày sinh nhật của mình .

HELLO phi đần

cạnh hình vuông là

\(\sqrt{121}\)=11

thể tích là

11 x 11 x 11 = 1331 (cm3)

Tìm tiếp số hạng thứ 6, thứ 100 của dãy số sau

\(\dfrac{-1}{a^2};\dfrac{2}{a^3};\dfrac{-6}{a^4};\dfrac{24}{a^5};...\)

Cho 31 số nguyên trong đó tổng của 5 số bất kì là dương. Chứng minh tổng 31 số đó là 1 dương

ai mk mk lại