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`1+2x=7`
`=>2x=7-1`
`=>2x=6`
`=>x=6÷2`
`=>x=3`
Vậy `S={3}`
`text{ta có}`
`<=>2x = 7-1`
`<=>2x=6`
`<=> x = 6 : 2`
`<=> x =3`
`text{Vậy} x=3`
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I. Read the following passage and put a word in the box in each of the numbered blanks: television importantpay comfortably cheap Television now plays such an (1) _________ role in so many people's life. First of all, (2) ________ is not only a convenient source of entertainment, but also rather a (3) ________ one. For a family of four, for example, it is more convenient as well as cheaper to sit (4) ________ at home than to go out. They don't have to (5) ________ for expensive seats at the theatre or in the cinema. II. Choose the correct word A, B, C or D for each gap to complete the following passage : I live in (1)________small village called Henfield. There (2)_______about 600 people here. I love the village because it is very quiet and life is slow (3)________easy. The village is always clean-people look (4)__________it with great care. The air is always clean, (5)_________ . It is much more friendly here than in a citybecause everyone knows everyone, and if someone has a problem, there are always people who can help. 1. A. aB. an C. theD. many 2. A. haveB. is C. areD. be 3. A. but B. and C. or D. because 4. A. afterB. for C. at D. with 5. A. also B. either C. so D. too III. Read the following passage and do the tasks below : Roger Federer is probably the best and most famous tennis player in the world today. He was born on August 8th, 1981 in Basle, Switzerland. His parents encouraged him to start playing tennis when he was 8 years old. He won his first Wimbledon title , The Wimbledon Junior, when he was sixteen. Over the next few years, he played all over the world. In Australia he played for his country in the 2000 Olympic Games. Then in 2003 he began to show how good he was. He started the year by winning two tournaments in a row, in Dubai and Marseilles. He also won his first Grand Slam title at the Wimbledon Championships. In 2004 he won 3 out of four grand Slam titles. When he is not playing tennis, Federer is busy with his special project, the Roger Federer Foundation, which helps disadvantaged children
cho tam giác IKH=tam giác EDF. Viết đẳng thức trên dưới một dạng khác. biết Ik =5cm, HK=7cm, EF=9cm. tính chu vi cửa mỗi tam giác 3: 3: 3:
Làm luôn để em gửi cô giáo với ạ
cho tam giác MNP có M =90 đô,đường cao MH,MN =2 căn 5,HP =8cm.tính diện tích tam giác MNP Hộ mình với ạ
Giúp mình với mình cần gấp ạaaaaa
Cho hình thang ABCD (AB // CD) có góc ACD = góc BDC. Chứng minh ABCD là hình thang cân
cho axit salixylic (axit 0-hidroxi benzoic) phản ứng vs anhidrit axetic ,thu dc axetyl salixylic dùng làm thuốc cảm .Để phản ứng hoàn toàn vs 43,2 gam axit axetylsalixylic cần vừa đủ V lít dd KOH 1M.TÍnh V làm chi tiết từng công đoạn nhé báo trước em bị mất gốc lm tắc báo mod ráng chịu
a, M=3a^2*(-2a^2-2a-1/3)*(-a-3) tại a = -2 b, P=1/2x^2y^2*(2x+y)*(2x-y) tại x=1 y = 1/2! Tính giá trị biểu thức
Tìm nghiệm nguyên dương của phương trình sau: `xyz=x+y+z`.
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