Find the word which has a different sound in the underlined part
1. A. class B. answer C. fat D. fast Âm a
2. A. great B. teacher C. stream D. meat Âm ea
3. A. dear B. wear C. nearly D. appear Âm ea
4. A. washes B. passes C. lakes D. couches Âm es
5. A. smile B. time C. kite D. miss Âm i
6. A. polluted B. prepared C. recycled D.watered Âm ed
7. A. the B. there C. think D. they Âm th
8. A. earth B. feather C. theater D. thanks Âm th
9. A. when B. where C. detective D. best Âm e
10. A. clumsy B. cute C. just D. but Âm u
11. A. weather B. newsreader C. teaching D. repeat Âm ea
12. A. game B. relax C. national D. channel Âm a
13. A. programme B. sport C. most D. show Âm o
14. A. thirty B. them C. both D. theme Âm th
15. A. schedule B. when C. red D. comedy Âm e

Find the word which has a different sound in the underlined part
1. A. class B. answer C. fat D. fast Âm a
2. A. great B. teacher C. stream D. meat Âm ea
3. A. dear B. wear C. nearly D. appear Âm ea
4. A. washes B. passes C. lakes D. couches Âm es
5. A. smile B. time C. kite D. miss Âm i
6. A. polluted B. prepared C. recycled D.watered Âm ed
7. A. the B. there C. think D. they Âm th
8. A. earth B. feather C. theater D. thanks Âm th
9. A. when B. where C. detective D. best Âm e
10. A. clumsy B. cute C. just D. but Âm u
11. A. weather B. newsreader C. teaching D. repeat Âm ea
12. A. game B. relax C. national D. channel Âm a
13. A. programme B. sport C. most D. show Âm o
14. A. thirty B. them C. both D. theme Âm th
15. A. schedule B. when C. red D. comedy Âm e

Đặt\(\frac{a}{b}=\frac{b}{c}=\frac{c}{d}=\frac{d}{m}=k\Rightarrow a=bk;b=ck;c=dk;d=mk\)

\(\Rightarrow a=mk^4;b=mk^3;c=mk^2;d=mk\)

\(\Rightarrow\frac{a}{m}=\frac{mk^4}{m}=k^4\)và   \(\left(\frac{a+b+c+d}{b+c+d+m}\right)^4=\left(\frac{mk^4+mk^3+mk^2+mk}{mk^3+mk^2+mk+m}\right)^4=^{\left(\frac{mk\left(k^3+k^2+k+1\right)}{m\left(k^3+k^2+k+1\right)}\right)^4}=k^4\)

\(\Rightarrow\frac{a}{m}=\left(\frac{a+b+c+d}{b+c+d+m}\right)^4\)(đpcm)

D

d nha

\(a.a\left(b+c\right)+3b+3c=a\left(b+c\right)+3\left(b+c\right)=\left(b+c\right)\left(a+3\right)\)

\(b.a\left(c-d\right)+c-d=\left(c-d\right)\left(a+1\right)\)

\(c.b\left(a-c\right)+5a-5c=b\left(a-c\right)+5\left(a-c\right)=\left(a-c\right)\left(b+5\right)\)

\(d.a\left(m-n\right)+m-n=\left(m-n\right)\left(a+1\right)\)

\(e.mx+my+5x+5y=m\left(x+y\right)+5\left(x+y\right)=\left(x+y\right)\left(m+5\right)\)

\(f.ma+mb-a-b=m\left(a+b\right)-\left(a+b\right)=\left(a+b\right)\left(m-1\right)\)

\(g.4x+by+4y+bx=4x+bx+by+4y=x\left(b+4\right)+y\left(b+4\right)=\left(b+4\right)\left(x+y\right)\)

\(h.1-ax-x+a=\left(a+1\right)-x\left(a+1\right)=\left(a+1\right)\left(1-x\right)\)

\(k.x^{m+2}-x^m=x^m\left(x^2-1\right)=x^m\left(x-1\right)\left(x+1\right)\)

\(m.\left(a-b\right)^2-\left(b-a\right)\left(a+b\right)=\left(b-a\right)^2-\left(b-a\right)\left(a+b\right)=\left(b-a\right)\left(b-a-a-b\right)=-2a\left(b-a\right)\)

\(n.a\left(a-b\right)\left(a+b\right)-\left(a^2-2ab+b^2\right)=a\left(a-b\right)\left(a+b\right)-\left(a-b\right)^2=\left(a-b\right)\left(a^2+ab-a+b\right)\)

A

a < b => 2a < a + b

c < d => 2c < c + d

m < n => 2m < m + n

=> 2(a + c + m) < a + b + c + d + m + n

=> \(\frac{2\left(a+c+m\right)}{a+b+c+d+m+n}< 1\) 

=> \(\frac{a+c+m}{a+b+c+d+m+n}< \frac{1}{2}\)

Phân số có tử bé hơn mẫu thì bé hơn 1

vì sao câu 5 nó lại bé hơn 1 vậy cậu