Đáp án+Giải thích các bước giải:
`a)4x^4+1`
`=(2x^2)^2+4x^2+1-4x^2`
`=(2x^2+1)^2-4x^2`
`=(2x^2-2x+1)(2x^2+2x+1)`
`b)4x^4+4y^4`
`=4(x^4+y^4)`
`=4(x^4+2x^2y^2+y^4-2x^2y^2)`
`=4[(x^2+y^2)^2-2x^2y^2]`
`=4(x^2-\sqrt{2}xy+y^2)(x^2+\sqrt{2}xy+y^2)`
Đáp án: + Giải thích các bước giải:
a)
$4x^{4} + 1$
$= 4x^{4} + 4x^{2} + 1 - 4x^{2}$
$= (2x^{2} + 1)^{2} - (2x)^{2}$
$= (2x^{2} - 2x + 1)( 2x^{2} +2x + 1)$
b)
$4x^{4} + 4y^{4}$
$= (2x^{2})^{2} + 2.2x^{2}.2y^{2} + (2y^{2})^{2} - 8x²y²$
$=(2x² + 2y²)² - (2\sqrt{2}xy)²$
$= (2x² + 2y² - 2\sqrt{2}xy)(2x² + 2y² - 2\sqrt{2}xy)$
Giúp em với ạ em không biết làm
II. Find ONE mistake in each sentence. 1. I have left the office as soon as you come back here 2. Have you hear from him since we left the school? 3. I have not receive a lot of information about that project since I moved to another team. 4. I haven’t had any news of John for 2003. 5. My parents first have met each other at the Olympic Games in 1982. 6. For the past two years I did a lot of things. 7. When I came to visit her last night, she is having a bath. 8. Mary was making a dress when she cuts her finger. 9. The company are planning to buy a lot of new equipment for its gym. 10. Don’t get off the bus until it stopped. 11.The assistant asked Helen whether those shoes was too small for her. 12.If you were on board now, you will experience those marvelous things. giải thích giúp mik nhé !!!
Câu 6. Biết y chia hết cho x. Uớc chung lớn nhất của x và y là : D. xy. А. 1 В. х С.У
giúp mình với nhanh lên nha mng :((
Giúp e dịch vs ạk . E sẽ vote cho 5 sao . Thanks you very much
Giải giúp mk bài này nhé, mk cảm ơn
Rearrange the sentences to make a conversation by writing the correct letter (A-H) in each blank. The conversation starts with number 0. 0 Mai: Nick, I know that Uncle Sam is a popular symbol of the United States, but I don’t know its origin. Do you know that? 44............. A. Nick: That’s right, Mai. And the town of Troy, New York is called “The Home of Uncle Sam”. 45.......... B. Nick: Well, the soldiers considered the barrels of meat as “Uncle Sam’s”. The local newspaper told the story and Uncle Sam had widespread acceptance as the nickname for the US government. 46........... C. Mai: Thank you so much, Nick. I wish I had a trip to New York. 47........... D. Mai: A meat supplier? How did the nick name Uncle Sam start, Nick? 48.......... E. Nick: The cartoonist Thomas Nast gave the white beard and stars-and-stripes suit to the image of Uncle Sam in the 1870s. 49.......... F. Nick: Yes, it’s also the nickname of the USA, Mai. The name is lined to Samuel Wilson, a meat supplier from Troy, New Work during the war of 1812. 50........... G. Mai: I think since that time it has been considered America’s national symbol. 51........... H. Mai: The story was simple. And who painted the image of Uncle Sam? MONG MN GIÚP ĐỠ !!!
Mn làm giúp mình từ câu h tới n nha
Nêu cảm cảm nhận về tâm hồn Bác qua hai bài thơ Cảnh Khuya và ramè tháng giêng ko chép mạng
cho tam giac ABC vuong tai A ,goc C =30 do, BC = 10 a , tinh AB ,AC b , ke tu A cac duong thang AM ,AN lan luot vuong goc voi cac duong phan giac goc trong va goc ngoai cua goc B . CMR :MN song song BC va MN=BC c , CMR: tam giac MAB dong dang voi tam giac ABC . tim ti so dong dang
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