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`(x+2y)^2`
`= x^2 + 2*2y*x + (2y)^2`
`= x^2 + 4xy + 4y^2`
`(2x-1)^2`
`= (2x)^2 - 2*2x*1 + 1^2`
`= 4x^2 - 4x + 1`
Khai triển hằng đẳng thức:
`=x^2+2.x.2y+(2y)^2`
`=x^2+4xy+4y^2`
`=(2x)^2-2.2x.1+1^2`
`=4x^2-4x+1`
Áp dụng hằng đẳng thức:
`(a+b)^2=a^2+2ab+b^2`
`(a-b)^2=a^2-2ab+b^2.`
EXERCISE 2: Fill in each blank with a suitable word to make meaningful sentences. complex|ailments|acupressure|advisable|affect acupuncture|allergy|capability|aromatherapy|alternative 1. He is showing his _______of being a strong and secure president through these troubled times. 2. Aging is an intricate,_________process that involves many areas of your body. 3. With stress so much a part of modern life, a weekly oil massage and relaxing_________can be beneficial for children. 4. Peanut flour is a cheap and quick____________method for thickening dishes. 5. A food__________________occurs when the immune system mistakenly believes that a harmless substance is harmful. 6. Since then, science, health, medicine and technology - and how they_________how we all live - have become central themes on the programme. 7. They work directly on the body's__________points to relax the nervous system. 8. The Chinese healing art of is ___________one that can be dated back at least two thousand years. 9. The courses at present are heavily booked so it is_________to put your name down early. 10. Patients with diabetes can develop other___________such as heart or kidney disease. EXERCISE 3- Fill in each blank with the synonym of the underlined word in each sentence. suggested|complicated|influence|illness hypersensitivity|ability|choice 1. ________________She could win the competition – she certainly has the capability. 2. ________________Features of financial products are becoming far too complex for the common man. 3. ________________Organisers have also made sure there will be alternative traffic routes available. 4. ________________Research from the United States suggests that the neighbourhood you live in can affect how well your children perform at school. 5. ________________It is not advisable to let young children out at night and they should always be supervised whenever possible. 6. ________________There is an increase in respiratory ailments, flu and accidents due to the bad weather. 7. ________________You might have a stuffy or runny nose because of a cold, the flu or seasonal allergies.
Nguyen tu nguyen to x co tong so hat co ban la 82 trong do so hat khong mang dien nhieu hon so hat khong mang dien la 2 tinh so hieu nguyen tu so khoi ki hieu nguyan to so luong cac hat trong x
1+2+3+4+5+..........+30+31+32 nhớ giải thích đầy đủ nhs
helppppppppppppppppppppppppppppp
cho hàm số bậc nhất y = ax - 3 Tìm a biết rằng khi x = 4 thì y = 2 hàm số này đồng biến hay nghịch biến trên tập số thực R
Bài 10 nè :333 Cố nhên mn uiiii~
Tinh rồi rút gọn 3/4+1/3+5/12= b,3/5+1/2-3/10 C, 1/4+1/2:2= d, 5/6-1/4×3
em cần gấp a,b ạ câu c để sau cx đc ạ làm ơn giúp e với
Bài 4: Trong kho có 3 tấn 8 tạ gạo tẻ . Số gạo nếp ít hơn số gạo tẻ 12 tạ . Hỏi trong kho có bao nhiêu tạ gạo tẻ và gạo nếp?
Làm chooooo em vứiiiiiiiii!!!!!!!!!!!!!!!!!!!!!!
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