i like .....
A. green B. swim C. sing a song
giup minh voi !!!!!!!!!!!!!!!!!
K
Khách
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LD
24 tháng 6 2017
1.Khoanh vào từ khác loại:
1. Sing classroom swim dance
2. football song badminton chess
3. play draw yesterday write
4. is am are a
5. picture red green black
24 tháng 6 2017
1.Khoanh vào từ khác loại:
1. Sing classroom swim dance
2. football song badminton chess
3. play draw yesterday write
4. is am are a
5. picture red green black
KY
10 tháng 9 2021
5. When I was a boy, I was used to go fishing with my father.
A B C D
6. My sister, Lan can neither sing or swim.
A B C D
7. She always wears modern and fashioned clothes when she is at work
A B C D
8. The last time he saw in public, he worn a great suit.
A B C D
27 tháng 9 2015
Đặt \(x=a-b,y=b-c,z=c-a\to x+y+z=0.\) Ta có
\(\left(a-b\right)^5+\left(b-c\right)^5+\left(c-a\right)^5=x^5+y^5+z^5=x^5+y^5+\left(-x-y\right)^5=x^5+y^5-\left(x+y\right)^5.\)
Mà \(\left(x+y\right)^5=x^5+5x^4y+10x^3y^2+10x^2y^3+5xy^4+y^5,\) suy ra
\(\left(a-b\right)^5+\left(b-c\right)^5+\left(c-a\right)^5=x^5+y^5-\left(x^5+5x^4y+10x^3y^2+10x^2y^3+5xy^4+y^5\right)\)
\(=-\left(5x^4y+10x^3y^2+10x^2y^3+5xy^4\right)=-5xy\left(x^3+2x^2y+2xy^2+y^3\right)\)
\(=-5xy\left(x+y\right)\left(x^2+xy+y^2\right)=5xyz\left(x^2+xy+y^2\right)\vdots5xyz=5\left(a-b\right)\left(b-c\right)\left(c-a\right).\)
Suy ra điều phải chứng minh.
27 tháng 2 2019
tu ke hinh
a, AB = 3cm (gt) => AB2 = 32 = 9 cm
AC = 4cm (gt) => AC2 = 42 = 16 cm
=> AB2 + AC2 = 9 + 15 = 25 cm
BC = cm (gt) => BC2 = 52 = 25 cm
=> BC2 = AB2 + AC2
=> tam giac ABC vuong tai A (dinh li Pytago dao)
b, AB = 3cm (gt); BQ = 3cm (Gt)
=> AB = BQ
=> tam giac ABQ can tai B (dn)
=> goc BAQ = (180 - goc ABQ) : 2 (1)
co goc ABQ + ABC = 180 (kb)
=> goc ABC = 180 - goc ABQ
BE la phan giac cua goc ABC (gt) => goc EBA = goc ABC : 2 (dn)
=> goc EBA = (180 - goc ABQ) : 2 (2)
(1)(2) => goc EBA = goc BAQ ma 2 goc nay so le trong
=> EB // AQ (dl)
c, co tam giac BAQ can tai B (cau b)
=> goc BAQ = goc BQA (dl)
Qx // AB => goc BAQ = goc AQK (slt)
=> goc BQA = goc AQK (tcbc)
xet tam giac AQI va tam giac AQK co : AQ chung
QI = QK (gt)0
=> tam giac AQI = tam giac AQK (c - g - c)
=> goc AIQ = goc AKQ (dn)
goc AIQ = 90 do I la hinh chieu cua A (gt)
=> goc AKQ = 90
co goc AKQ + goc BAC = goc CAK ma goc BAC = 90 do tam giac ABC vuong tai A (cau a)
=> goc CAK = 180
=> C; A; K thang hang
LG
1
KY
4 tháng 3 2020
Normally, when I have free time, I usually play sports, watch tv, surf webs and read books. After learning stressful hours , activities such as(such activities) help me entertain and relax. And playing sport is the free time activity I like best. Firstly, I like to play sport because it is really a healthy activity . You know sports provide many benefits for our health(lặp vế dưới). It can improve(s) (our)health and help us to be strong. Addition(in addition), sport help us increase in statue and have a excellent body. Secondly, I like sports. I feel as dynamic as possible. Moreover, It make(s) me full of energy. Lastly, well, It is what I enjoy most when playing sports. That is sports which can help us take up the community. We will knows a lot of peoples because of having the same interests in playing sport(s). True trust me, I was acquainting have got acquainted with a lot of friends when I play sports. In short, I like to play sport(s) because it provides many benefits for me.
a
100% lun nha
i swim nha bạn