a<b<c<d<m<n là các số nguyên.CMR:\(\frac{a+c+m}{a+b+c+d+m+n}< \frac{1}{2}\)
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1. A stand B apple C hand D father
2. A dark B cancel C action D travel
3. A fantastic B part C fact D camera
4 A automatic B had C activity D yard
5 A calm B bag C cat D bad
6 A animal B card C heart D cart
7 A thanks B caner C channel D smart
8 A land B start C stand D plastic
9 A bag B that C can D star
10 A plant B hat C far D plan
A=(a+b)(b+c)(c+a)+abcA=(a+b)(b+c)(c+a)+abc
=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc
=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)
=(a+b+c)(ab+bc+ca)=(a+b+c)(ab+bc+ca)
Vậy....
I. Find the word which has a different sound in the part underlined: ( Chữ gạch chân là chữ a )
1. A stand B apple C hand D father
2. A dark B cancel C action D travel
3. A fantastic B part C fact D camera
4 A automatic B had C activity D yard
5 A calm B bag C cat D bad
6 A animal B card C heart D cart
7 A thanks B caner C channel D smart
8 A land B start C stand D plastic
9 A bag B that C can D star
10 A plant B hat C far D plan
Chọn từ phát âm khác
1 A potato B bread C gray D they
2 A . Asian B anyone C send D debt
3 A gate B safe C tape D ready
4 A them B met C . Canadian D get
5 A heavy B date C late D lake
6 A bell B bed C tell D Australian
7 A cape B breath C mane D mate
8 A crazy B pen C scent D stretch
9 A fate B leather C paid D date
10 A member B pray C tender D November
Chọn từ phát âm khác
1 A potato B bread C gray D they
2 A . Asian B anyone C send D debt
3 A gate B safe C tape D ready
4 A them B met C . Canadian D get
5 A heavy B date C late D lake
6 A bell B bed C tell D Australian
7 A cape B breath C mane D mate
8 A crazy B pen C scent D stretch
9 A fate B leather C paid D date
10 A member B pray C tender D November
I.Find the word which has a different sound in the part underlined.
1. A.coffee B.pot C.bottle D.one
2. A.hat B.map C.what D.cap
3. A.what B.yogurt C.problem D.morning
4. A.was B.wall C.walk D.water
5. A.talk B.salt C.sausage D.cause
6. A.flower B.flour C.cow D.pork
7. A.soon B.food C.noodle D.cook
8. A.wash B.warm C.wall D.walk
9. A.morning B.forty C.forget D.pork
10. A.wash B.bag C.pan D.add
11. A.aunt B.sauce C.caught D.daughter
12. A.daughter B.sauce C.laundry D.aunt
13. A.wash B.draw C.on D.off
14. A.bottle B.roll C.soft D.coffee
15. A.document B.naughty C.water D.audience
1.D
2.C
3.D
4.A
5.C
6.D
7.D
8.A
9.C
10.A
11.A
12.D
13.A
14.B
15.A
giúp mình làm bài này đi rrooiif mình giúp cho
cho tam giac abc . co canh bc=12cm, duong cao ah=8cm
a> tinh s tam giac abc
b> tren canh bc lay diem e sao cho be=3/4bc. tinh s tam giac abe va s tam giac ace ( bằng nhiều cách
c> lay diem chinh giua cua canh ac va m . tinh s tam giac ame
tìm từ có cách phát âm khác loại
A.check B. recycle C. reuse D. evironment
A. then B. them C. thing D. their
A. start B. marbles C. stars D. solarAcave
A. cave B. famous C. late D. channel
A. hear B. dear C. bear D. fear
A.call B.fall C.match D. wall
A. prepared B. polluted C. watered D.recycled
A.check B. recycle C. reuse D. evironment
A. then B. them C. thing D. their
A. start B. marbles C. stars D. solarAcave
A. cave B. famous C. late D. channel
A. hear B. dear C. bear D. fear
A.call B.fall C.match D. wall
A. prepared B. polluted C. watered D.recycled
\(1)\left(a+b\right)\left(a+b\right)\)
\(=a\left(a+b\right)+b\left(a+b\right)\)
\(=a^2+ab+ba+b^2\)
\(2)\left(a-b\right)\left(a-b\right)\)
\(=a\left(a-b\right)-b\left(a-b\right)\)
\(=a^2-ab-ba-b^2\)
\(3)\left(a-b\right)\left(a+b\right)\)
\(=a\left(a+b\right)-b\left(a+b\right)\)
\(=a^2+ab-ba+b^2\)
1, (a+b)(a+b) = (a + b)2
2, (a-b)(a-b) = (a - b)2
3, (a-b)(a+b) = a2 - b2
4, (a+b)(a+b)(a+b) = (a +b)3
5, (a-b)(a-b)(a-b) = (a - b)3
6) ( a+b)(a2 - ab + b2) = a3 + b3
7) (a-b)(a^2+ab+b^2) = a3 - b3
\(\dfrac{a+c+m}{a+b+c+d+m+n}< \dfrac{a+c+m}{a+c+m+a+c+m}\)
\(=\dfrac{a+c+m}{2a+2c+2m}=\dfrac{1}{2}\) ( do a < b < c < d < m < n )
\(\Rightarrowđpcm\)
\(\dfrac{a+c+m}{a+b+c+d+m+n}< \dfrac{a+c+m}{a+b+c+a+b+c}\left(a< b< c< d< m< n\right)\)\(\Rightarrow\dfrac{a+c+m}{a+b+c+d+m+n}< \dfrac{a+c+m}{2a+2c+2m}\)
\(\Rightarrow\dfrac{a+c+m}{a+b+c+d+m+n}< \dfrac{a+c+m}{2\left(a+c+m\right)}\)
\(\Rightarrow\dfrac{a+c+m}{a+b+c+d+m+n}< \dfrac{1}{2}\rightarrowđpcm\)