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Vì :
\(\frac{a}{b}=\frac{c}{d}\Rightarrow ad=bc\) (nhân chéo)
Ta có :
\(ab=cd\)
\(\Rightarrow a:d=b:c\)
\(\Rightarrow\frac{a}{b}=\frac{c}{d}\) ( đpcm )
I. Find the word which has different sound in the part underline
1 A traffic B same C crash D jam
2 A let B jet C vehicle D success
3 A foot B scooter C shoot D food
4 A sky B fly C by D hymn
5 A vehicle B rehearse C helicopter D perhaps. ( chữ h )
=>Xem lại hộ bài trọng âm nhes
I. Choose the word whose underlined part is pronounced differently from that of the others by circling the corresponding letter A or B, C, D.
1. A. happy B. apple C. act D. aunt
2. A. mind B. bike C. fit D. tidy
3. A. school B. chair C. church D. chat
4. A. health B. team C. tea D. sea
5. A. sun B. fun C. son D. put
6. A. excited B. interested C. worried D. painted
7. A. use B. computer C. duty D. shut
8. A. chair B. fair C. pair D. are
9. A. how B. know C. town D. brown
10. A. season B. break C. great D. steak
I. Choose the word whose underlined part is pronounced differently from that of the others by circling the corresponding letter A or B, C, D.
1. A. happy B. apple C. act D. aunt
2. A. mind B. bike C. fit D. tidy
3. A. school B. chair C. church D. chat
4. A. health B. team C. tea D. sea
5. A. sun B. fun C. son D. put
6. A. excited B. interested C. worried D. painted
7. A. use B. computer C. duty D. shut
8. A. chair B. fair C. pair D. are
9. A. how B. know C. town D. brown
10. A. season B. break C. great D. steak
.Find out corect one mistake in A,B,C or D of each sentece and then correct
1. He slept=>was sleeping in his room when the fire alarm rang.
2.Shall=>Will you close the window for me, please?
3. He gets up early in order to reviewing=>review lessons before school
4. The ambulance will be there for=>in about ten minutes
5. I've been leaning English since=>for 4 years
bn cho mik biết cách làm mấy bài như này dc k ạ! thx nhìu!
Mr. Brown is the landlord ...... we rent the house.
A. who B. whom C. from whom D. of whom
Choose the word which has the different stress from the others (0,5p)
1, A- explain
B-surgery
C-improve
D-material
2, A-measure
B-prefer
C- period
D-distance
3, A- address
B-amazing
C-author
D-complain
4, A-event
B-essay
C-compliment
D-employee
5, A-surprising
B-terrible
C- awful
D-furnished
D
Đáp án A, C từ kết thúc đuôi –ic, -ial trọng âm rơi vào trước nó
Đáp án B đuôi –ment không nhận trọng âm xét nguyên thể invest trọng âm thứ 2
Đáp án D /ˌʌn.dəˈɡəʊ/