1, x² - 2xy - x²y + 2y²
⇒ x² - 2xy - x²y + y² + y²
⇒ (x² - 2xy + y)-( x²y +y²)
⇒ (x - y)² - y ( x - y)²
⇒ (1 - y).( x - y)
2, a² - x² + 2a + 1
⇒ (a² + 2a + 1) - x²
⇒ (a + 1)² - x²
⇒ (a + 1 - x).(a + 1 + x)
Đáp án:
\(1)\ x^{2}-2xy-x^{2}y+2y^{2}=(x-y)^{2}+y(y-x^{2})\\ 2)\ a^{2}-x^{2}+2a+1=(x+1-x)(a+1+x)\)
Giải thích các bước giải:
\(1)\ x^{2}-2xy-x^{2}y+2y^{2}\\ =x^{2}-2xy+y^{2}+y^{2}-x^{2}y\\ =(x^{2}-2xy+y^{2})+(y^{2}-x^{2}y)\\ =(x-y)^{2}+y(y-x^{2})\\ 2)\ a^{2}-x^{2}+2a+1\\ =(a^{2}+2a+1)-x^{2}\\ =(a+1)^{2}-x^{2}\\ =(x+1-x)(a+1+x)\)
chúc bạn học tốt!
Giúp mk 2-5 thôi Đúng như trong vở của các bạn Những câu hỏi đó mình nộp lên lên trường đó chứ không phải cô giáo đâu nên mong các bạn làm cho đúng
vẽ cho tui ảnh cô gái đag ngắm hoàng hôn nha full màu và chữ kí nhá đẹp tui full cho 5 s và ctlhn nha cấm spam
Giải hộ em với cứu em 1."May I drink some beer,Dad"? -> Tuan asked 2.Although Hoa is sick,she keeps working -> Hoa is 3.Don't tell lies or no one will love you -> If 4.The shirt is cheaper than the dress -> The dress is 5.No one else in the world is so fat as that woman -> That woman 6.Can you take care of the dog while I'm away? ->Do you mind looking 7.Bolth the student and the teacher are pleased with the final result ->Not only 8.Did you write the letter in ink -> You 9.They did the test easily -> They had 10.You forgot to turn off the lights,didn't you -> You didn't 11.The man drove so carelessly that he caused a terrible accident -> He was 12.You've performed very excellentl,Nga! ->We complimented Vll. Rearrange words into the full sentences 1.home/who/downtown/last night/The man/in a three-floor house/me/lived/drove 2.because/all like/not only/terrific/Minh/he's/kind/We/but also 3.studied/Miss Hoa/for four years/she/After/at/high school/that university/from/had graduated
Mong mọi người giúp đỡ em ăn Vẽ mặt trăng cho em đi😭😭
Cho tam giác ABC vuông tại A, đường phân giác AD, đường cao AH. Biết BD=75cm, CD=100cm. Tính các độ dài BH, CH.
Tại sao khi có ánh sáng chiếu vào gương thì nó phản chiếu lại? Mình đứng vào ánh sáng phản chiếu đó rồi nhìn vào gương thì xung quanh gương có những tia sáng phát ra có cả những tia có cầu vồng?
37-2a /50=1/2
vẽ kiếm sĩ là nữ nhoa
Trả lời giúp em mấy câu hỏi ở dưới Gymnastics is a competitive sport that test an athlete's strength, rhythm, balance, flexibility, and agility. The Federation Internationale de Gymnastique (FIG) was formed on 23rd July 1881 when representatives of the Gymnastics Association of Belgium, France and the Netherlands met in Liege. As a governing body, it is held in high esteem by both its member federations and gymnastics clubs throughout five continents. In 1897, seventeen national associations joined together to form the basis of the European Gymnastics Federation. However, when the USA was admitted in 1921, the Committee changed its name to the Federation Internationale de Gymnastique, as it is known today. FIG comprises three Olympic disciplines: Artistic, Rhythmic and Trampoline. Each discipline is controlled by a Technical Committee made up of a Technical President and six members. The Technical Committees are responsible for coordination and control of their specific discipline in term of the technical requirements for competition as they relate to each specific discipline. In Artistic events (performed on an apparatus), men compete in floor, pommel horse, rings, vault , parallel bars and horizontal bars. Female gymnasts compete on the vault, uneven bar, balance beam and floor. The competition includes all-round events and team events, also scored over each apparatus. Artistic events consist of prescribed sets of events, each of which is scored separately by judges to determine a winner. When Rhythmic gymnastics first caught the attention of the Federation Internationale de Gymnastique in the middle of the 20th century, its devotees were calling it "modern gymnastics". Rhythmic gymnastics (perform with an apparatus) is strictly a women's competition. The gymnasts, accompanied by music, perform on a 13 meter-square floor area with rope , hoop , ball, clubs and ribbon. In the individual event, they perform different routines with four of the five apparatus. In team competition, team of five perform together once using clubs and once with two using hoops and three using ribbons. Rhythmic gymnastics consists of several events in which gymnasts use objects such as balls and hoops while performing choreographed routines, which are judged to determine a winner. On the 1st January 1999, Trampoline became a discipline of gymnastics at the Olympic Games. Trampoline gymnastics debuted at the Sydney 2000 Games featuring both men's and women's individual events. Trampoline competitions are open to both men and women.
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