I love and pride in his family.

My little family always laughter filled my father's mother's voice and the warm hospitality of the boys. My father was the army which fought the battle field, hitherto working in the military sector. Perhaps because undergo years of training and fighting, my father became more upright and strict but also very funny, witty. On the surface, tough father but the weight back very emotional. Dad is a solid pillar of the family. Dad is not only a spiritual fulcrum for all mothers but also with my sister.

Unlike my father, mother is the woman soft, gentle and dependable. As women Vietnam so far has been there forever, mother hard, sacrificed without a word of complaint. Mother always considered family care is happiness. With us, your mother has to be the medium is the greatest teacher. Parents idol in my heart. Funny, most hyperactive of none other than the six-year-old brother. This year, it will be in the first grade. Excitedly watched him prepare everything for the new school year, I see myself as of five years ago, also in the morning so innocent. Still restless but obedient and intelligent children. My sister and I can play together all day without getting bored. If a day without human voice your laughter, my family seems empty, I'll miss you most extremely ...

My little family happy. There will also be times of trouble or experiencing storm stormy but my family will forever remain resilient because everyone has a heart of love, trust.

a) Xét ΔACM và ΔBEM có :

góc EMB = góc AMC ( đối đỉnh)

EM = MC ( GT)

AM= MB ( M là trung điểm AB)

--->ΔACM = ΔBEM(c.g.c)

b)Vì ΔACM = ΔBEM

---> góc EBM = góc BAC = 90'(2 góc tương ứng)

--->EB vuông góc với BA

c)Vì AB cắt AE và BC tạo hai góc so le trong bằng nhau góc EBM = góc BAC

--->AE song song với BA

gọi độ dài của ba cạnh tam giác là a, b, c

ta có a, b, c, tỉ lệ vói 2, 5, 9

--->\(\frac{a}{2}=\frac{b}{5}=\frac{c}{9}\) ; c-a= 14

--->​\(\frac{a}{2}=\frac{b}{5}=\frac{c}{9}\)​​ = \(\frac{c-a}{9-2}\)=\(\frac{14}{7}\) = 2

--->cạnh a= 2 . 2 = 4 cm

cạnh b = 2 . 5 = 10 cm

cạnh c = 2 . 9 = 18 cm

a)Xét ΔAMD và ΔCMB có :

góc AMB = góc CMD ( đối đỉnh)

AM = NC ( GT)

BM = MD ( GT)

--->ΔAMD = ΔCMB(c.g.c)

b) ta có góc CAD = góc ACB(ΔAMD = ΔCMB)

tạo ra hai góc so le trong bằng nhau

--->AD//BC

c)Xét ΔABC và ΔCDA có :

AC : cạnh chung

AD = BC (ΔAMD = ΔCMB)

góc CAD = góc ACB(ΔAMD = ΔCMB)

--->ΔABC = ΔCDA(c.g.c)

d)ta có AE + ED = AD

AF+ FC = BC

mà EF= BF; AD = BC

--->AE = FC

xét ΔAFC và ΔACE có :

AE = FC (CMT)

AC : cạnh chung

góc CAE = góc ACF (ΔAMD = ΔCMB)

--->ΔAFC = ΔCEA ( c.g.c)

--->góc AEC = góc AFC ( hai góc tương ứng)

--->góc AEC = góc AFC=90'

--->AF vuông góc với BC

Có 4 dung dịch: X (Na₂SO₄ 1M và H₂SO₄ 1M); Y (Na₂SO₄ 1M và Al₂(SO₄)₃ 1M); Z (Na₂SO₄ 1M và AlCl₃ 1M); T (H₂SO₄ 1M và AlCl₃ 1M) được kí hiệu ngẫu nhiên là (a), (b), (c), (d). Tiến hành các thí nghiệm sau:

➢ Thí nghiệm 1: Cho 2V ml dung dịch Ba(OH)₂ 1M vào V ml dung dịch (a), thu được n₁ mol kết tủa.

➢ Thí nghiệm 2: Cho 2V ml dung dịch Ba(OH)₂ 1M vào V ml dung dịch (b), thu được n₂ mol kết tủa.

➢ Thí nghiệm 3: Cho 2V ml dung dịch Ba(OH)₂ 1M vào V ml dung dịch (c), thu được n₃ mol kết tủa.

➢ Thí nghiệm 4: Cho 2V ml dung dịch Ba(OH)₂ 1M vào V ml dung dịch (d), thu được n₄ mol kết tủa.

Biết rằng n₁ < n₂ < n₃ < n₄.

Dung dịch (b) ứng với dung dịch nào sau đây

A. X

B. Y

C. Z

D. T

Perhaps when it comes to school is not a distant concept for all of us. Everyone has a school imprinted in my mind that when I can not go to forget his beloved school roof.

For me Phan Chu Trinh secondary school is the school that I loved. The whole school is a yellow dye looks very nice and the sun shining down make it become more vibrant. When approaching you can see a school gate are bold blue text "Phan Chu Trinh secondary school." Despite many years but was still very nice gate still stalked like to welcome everyone to the school. Blue gate of the old school when the guard opened it pulled into the creaking so merrily. The port expansion is always like a mother who always greeted us step into the world of knowledge of words or reason. Go through the main entrance is a small constellation, which is where the guard work and student control. Step into the magnificent school but still no shortage of features ancient solemnity.

Schools have been built over thirty years ago should already quite old but ancient ones that make school more beautiful unfamiliar with everyone to come here. The new school playground was paved with cement should look white. In case you are going through a long phoenix trees loose ball looks like entering a paradise of nature. Our kids tease each other that trees love trees. We did not know it had ever since I only know my father said that since the school has announced it already. The birds compete to play hide and seek on the branches make phoenix singing tingle becomes a romantic setting and a mysterious shimmer. The school building is divided into two two-story buildings, but it is an area for a two-three area classes for grades four and five. Classes are decorated with funny pictures so that each classroom furnished with chic black decorum Statistics lovely. In the classes are hanging picture of Uncle Ho and Uncle Ho taught five things very neatly, as it is the teacher's desk.

It's nice to step into our 71 classes. The space is beautiful and friendly, it is the school's warm us.Our policy is where we salute the flag and all organizations of our activities with the school are going on here. The school has a lot of great old trees shade below the stone seats have the hardworking pupil she was studying for school bai.San is also where every time out to play it again highlighted the colors of the game we often played or play. Side walls of the building for students in grades four and five is the engine room for our two computer learning.

On the first day of school or the Vietnam Teachers' Day, we again welcome the alumni of the school that we are very proud du.Toi very proud to be a student of a school named after a brother Phan Chu Trinh national hero

Secondary schools were imprinted lifetime my beautiful childhood. Though far away where I can not forget this school roof.

Van Mieu - Quoc Tu Giam is relic and rich diversity of the city's leading Hanoi, located in the south of Thang Long. Currently, it was the Prime Minister Vietnam put on the list ranked 23 national monuments in particular. Architectural ensemble Van Mieu - Quoc Tu Giam, including: Lake Van, the Van Mieu - Quoc Tu Giam and garden director and architectural subjects are Literature - a shrine to Confucius and the Temple of Literature - the first university Vietnam. Temple of Literature - Quoc Tu Giam mallet brick walls surrounding, inner space divided into five classes with different architectures. Each class that space is limited by the brick wall with three gates to communicate with each other (including the door between the two parties and two side doors). From outside to inside with the ports respectively: port of Literature, University of China, Dai Thanh and ergonomics. With over 700 years of operation has trained thousands of talents for the country. Now, the Temple of Literature where sights of domestic and foreign tourists as well as where the compliments for excellent student and also a place to organize the annual poetry on the fifteenth day of January. In particular, there is the element of today's officers to "good luck" before each exam