\(\frac{7}{5}=\frac{2x+1}{3x+5}\)

=> 7. (3x+5) = 5 (2x+1)

=> 21x+ 35 = 10x + 5

=> 21x - 10 x = 5 - 35

=> 11x = -30

=> x = -30/11

kết quả phép tính này =0 nha bạn

k mik nha.

            12225

x                  4

           ---------------

              48900

12245

48980

a, \(\frac{3}{4}x-\frac{1}{5}=\frac{7}{4}x+\frac{11}{5}\)

\(\Rightarrow\frac{3}{4}x-\frac{7}{4}x=\frac{11}{5}+\frac{1}{5}\)

\(\Rightarrow-x=\frac{12}{5}\Rightarrow x=-\frac{12}{5}\)

Vậy ... 

b, \(\frac{x+1}{2}=\frac{8}{x+1}\)

\(\Rightarrow\left(x+1\right)^2=16\)

\(\Rightarrow x+1=4\)hoặc \(x+1=-4\)

\(\Rightarrow x=3\) hoặc  \(x=-5\)

Vậy ..

3/4x-7/4x=1/5+11/5

(3/4-7/4).x=12/5

-1.x=12/5

x=12/5:-1

x=-12/5

vậy x=-12/5

a,\(\frac{3}{4}x-\frac{1}{5}=\frac{7}{4}x+\frac{11}{5}\)

\(< =>\frac{3x}{4}-\frac{7x}{4}=\frac{11}{5}+\frac{1}{5}=\frac{12}{5}\)

\(< =>-\frac{4x}{4}=\frac{12}{5}< =>-x=\frac{12}{5}\)

\(< =>x=-\frac{12}{5}\)

b, \(x+\frac{1}{2}=\frac{8}{x}+1\left(đk:x\ne0\right)\)

\(< =>x-\frac{8}{x}=1-\frac{1}{2}=\frac{1}{2}\)

\(< =>\frac{x^2-8}{x}=\frac{1}{2}\)

\(< =>2x^2-16=x\)

\(< =>2x^2-x+16=0\)

\(\Delta=\left(-1\right)^2-4.2.16 < 0\)

Vô nghiệm  :V bài này sai đề

I dont have much spare time. Although all of my time is devoted for the hard work at the school, I manage to get some time to relax. I especially like the weekends for at that time I can go out for cafe, go to open air recreation centers to play sport games such as: tennis, volley ball, martial arts, or swimming. I often play online games but they are not as attractive as others open air activities or sport games. Sometimes I go for a picnic to a beautiful sightseeing. Friendly activities also make me feel relaxed. I am stressed while studying too hard so these activities relax me and help me have good performance in studying a lot.

Mk hiếm khi free lắm :))

As a student, I am quite busy on weekdays. However, at weekends, I have much free time, so I usually spend it on relaxing to prepare for a coming busy week. First of all, in my free time, I like playing some sports, such as soccer, badminton or basketball, with my friends. Sport not only makes me stronger but also connects me with my friends who have the same hobbies. We sometimes go riding in order that we can combine sporting activity and sightseeing. If the weather is not fine enough for me to hang out with my friends, I like to read books. I have a big bookshelf with many kinds of books but I prefer science books. Through these books, my knowledge is gradually enlarged. Thirdly, I also love to listen to music from pop, rock 'n roll to rap or melody. I can listen to music at any place with a small but modern Ipod which is my father's gift for my 18th birthday. Sometimes, I dance freely when listening to my favorite songs. Music really paints my life. Last but not least, I spend my free time on surfing on Internet. I can chat with my friends from very far distance or log on websites to read online news. With Internet, I update many things without having to go anywhere. I can also study English through some interesting websites. (If I have very difficult exercises and cannot solve them by myself, I will visit Yahoo Answers and have somebody to help me. Just like this one ^^). In conclusion, I want to use all of my free time to relax and connect with other people. 
viet ve nguoi than: 
Mother, the new voice was heard how dear! Mother who gave birth to the children, adopted children grow up, teach you how things should have. She is the first person we met since he was new to life, sucking the sweet milk as his mother's unfailing love. And also the incredible light that has illuminated my soul. She sacrificed her life for us, worried about what to eat, what to wear to books and learning. Remembered the way, she came home from work, sweat drenched shirt back, the morning dawn, shadows mother gently as fear we wake up. Mother's love for the outpouring of course, never with, and that's probably also the second most noble love that we see throughout life. Forgot why the time is good, he commended, ... Meanwhile, the new mother looked gentler how! Smile, for life and I will never forget, and when we fail, a new mother ... look at this unhappy, sad how! Time, we feel very sorry, sorry for you too! But she was not angry long, she always tolerant, forgive us many things. Tolerance was great, it did not we rely that help us move forward, trying to learn ... Not only that, in her poems of the poet Tran Quoc Minh said that the stars in the sky nor by the mother has for us. It reminds me a beautiful anniversary of his mother's endless love. That day, I was seriously ill, she must leave to take care of you, one night when I had slept soundly, wake up and see her still sitting there, his eyes looked at me lovingly, compassion. Her well enough to know she loves us how much. Oh! thinking of his mother's love for me, I suddenly found my love for her outpouring impossible beyond measure, and I will try to learn it's better to respond to the immense love of his mother, I will try gifted it to respond to this love. "Mother" brilliant voice of life.

tôi có 3 bài bạn xem bài nào bạn chọn nhé:

Câu 1:I have no more free time, I usually over head and ears to learn on class. But I always find free time to relax. I have special like on weekend. When I and my friends go to have coffee, or go to open-air relax centre to play sport as tennis, volley ball, kung fu, or even swimming. I occasionally play online game, but It is not more attractive than open – air activities, sport. Some time we have going picnic to where have much beauty landscape, act exchanges with friend make me satisfied. Learning some time make me stressful therefore recreational activities that make me more comfortable very much, and then I learn more fervent.

Câu 2:I don't have much spare time as I am always over head and ears in studying at school but I still find a little time for me to relax. I especially love the weekend when I can go out with my friends for a cafe or go to the opening entertainment center to play sports such as tennis, volleyball, martial art or even swimming. I also play game online but it is not as attractive to me as playing sports outdoor. Sometimes we have small picnics to beautiful places which interest me. Studying sometimes makes me stress so that playing activity makes me feel more comfortable, and after that I can be engrossed in studying.

Câu 3:I don't have much spare time. Although all of my time is devoted for the hard work at the school, I manage to get some time to relax. I especially like the weekends for at that time I can go out for cafe, go to open air recreation centers to play sport games such as: tennis, volley ball, martial arts, or swimming. I often play online games but they are not as attractive as others open air activities or sport games. Sometimes I go for a picnic to a beautiful sightseeing. Friendly activities also make me feel relaxed. I am stressed while studying too hard so these activities relax me and help me have good performance in studying a lot.

cảm ơn mọi người đã ủng hộ cho mình và cả bạn nữa cảm ơn nhé mọi người 

chúc mọi người thành công và phát đạt thành công chúc mọi người may mắn

tích của bao nhiu lũy thừa cũng đc đúng ko

\(10.10.10.10.5.2.5.2.10.5.2.10.3\\= \left(10.10.10.10.10.10\right).\left(5.2.5.2.5.2\right).3\\ =10^6.10^3.3\\ =10^9.3\)

A,= -315.4-275+4.315-10+275

=[(-315.4)+4.315]+(-275+275)-10

=-10

b,=[(-2,5.0,4).0,375]-[(-8.0,125).3,25]

=[-1.0,375]-[(-1).3,25]

=-0,375-(-3,25)

=-0,375+3,25=2,875