bài 2. một người đi xe máy từ A đến B mất 6h . lức về đi từ B đén A người đó đi với vận tốc nhanh hơn 4km/h nên chỉ mất 5h . tính quãng đường AB
bài 3. lúc 7h một ô tô xuất phát từ tỉnh A đến B vời vận tốc 60 km/h. cũng cùng thời gian ấy một xe mấy xuất phát từ tỉnh B đến A với vận tốc 50km/h . biết hai tỉnh A và B cách nhau 220 km . hỏi sau bao lâu 2 xe gặp nhau và gặp nhau lúc lúc mấy giờ
bài 4. một người lái ô tô dự dịnh với vận tốc 48 km/h . nhưng sau khi đi 1h với vận tốc ấy , ô tô bị tầu hỏa chặn 10 phút . do dó để đến B đúng thời gian quy định người đó tăng thêm 6 km/h . tính quãng đường AB
bài 5. một xe máy từ A đến B với vận tốc dự dịnh 30 km/ h đi đc nửa đường xe máy tăng vận tốc 40 km/h nên đến B sớm hơn 30 phút . tính quãng đường AB
\(B=\left\{\frac{21}{x^2-9}+\frac{x-4}{3-x}-\frac{x-1}{3+x}\right\}\left\{1-\frac{1}{x+3}\right\}\)
a. rút gọn B
b. tính giá trị của biểu thức B biết x thỏa mãn | 2x + 1 | = 5
c. tìm x để B = \(-\frac{3}{5}\)
d. tìm x để B < 0
1. we have to start warly ___________ we don't be late
a: so that b: so as to c. because d. although
2. the school boys are in hurry ___________ they will not be late for school
a: so as to b: to c: in order that d: for
3. we set off early ____________ we wouldn't get stuck in the traffic
a. although b. so that c. because d. in case
4. my mother went to london ____________ see my aunt's family
a in order to b. so thta c. not to d. not
1. people use money so that they can buy things they need [ in order to ]
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2. banks are developed so that they can keep people's money safe [in order to ]
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3. I need to buy some laundry detergent so that I will wash my clothes [ in order to ]
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4. I came to this school so that I could learn english [ in orfer to ]
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5. tom was playing very softly so that he wouldn't disturb anyone [ in order not to ]
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6. they rushed into the burning house so that the could save the child [ in order to ]
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7. lan often attends english speaking club so that she can practice speaking englisd [ ao as to ]
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ex3. change from phrase into clause
1. we hurried to school so as not to be lare
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2. he climbed the tree in order to get a better view
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3. some young people like to earn their own living in order to be independent of their patents
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4. we should do morning exercises so as to improve our health
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5. we should take advantage of the scientific achievements of the world soas to develop our national economy
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6. every people in the world must unite their efforts to maintain and protect peace
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7. she put on warm clothes so sa not to catch the cold
ex2. match the sentences , using so that / in order to that.
1. mary often goes home as soon as the class in over . she doesn't want her mother to wait for her
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2. I took my camera . I wanted to take some photos
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3. he studied really hard . he wanted to get better marks
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4. jason learns chinese . his aim is to work in china
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5. I've collected money . I will buy a car
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6. many people left turkey in 1960s . they wanted to find jobs in germany
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7. she attends to acourse . she wants to learn chess
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8. linda turned on the lighs . she wanted to see beter
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