giúp mik câu này zới:
There were 13 commuters on the eastbound subway train.
Carl told his mum that at least 2 of the commuters were born in the same month of the year.
Was Carl correct?
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Bài 1: First task:
Let \(x\) be the number of sparrows on the first lamp post at first. (\(x\) is a positive integer).
\(\Rightarrow16-x\)is the number of sparrows on the second lamp post at first.
We have: \(x-2+3=16-x+2-3\Leftrightarrow2x=14\Leftrightarrow x=7\)
Hence there are 7 sparrows on the first lamp post at first, 9 sparrows on the second lamp post at first.
Bài 2: Second Task
We can find 2 students who were born on the same day.
There are 30 days in April and 31 students were born on that month. Apply the Dirichlet 's theorem, we can ensure that threre exists at least one day where 2 students were born.
Hai kệ sách tất cả chứa 120 cuốn sách .
Chuyển 20 cuốn sách từ kệ thứ nhất sang kệ thứ hai.
Chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất.
Hai kệ bây giờ có số sách bằng nhau.
Có bao nhiêu cuốn sách trên mỗi kệ lúc đầu?
Giải
Chuyển 20 cuốn sách từ kệ thứ nhất sang kệ thứ hai và chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất tức là chuyền 10 cuốn sách từ kệ thứ hai sang kệ thứ nhất thì số sách ở hai kệ bằng nhau.
Suy ra lúc đầu kệ thứ hai hơn kệ thứ nhất là : 10+10=20 (cuốn sách)
mà tổng số sách ở hai kệ là 120 cuốn
=> Số sách ở kệ thứ nhất là : (120-20):2=100:2=50 (cuốn)
<=> Số sách ở kệ thứ hai là : 120-50=70(cuốn)
Vậy kệ thứ nhất có 50 cuốn sách và kệ thứ hai có 70 cuốn sách
Hai kệ bây giờ có số sách bằng nhau.
Chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất.
Chúc bạn học tốt
WRITE ONE SUITABLE WORD
Jack London was born in San Francisco, California, in 1876. He took a high place in American literature at the beginning of the twentieth century At that time, the library shelves and bookshops of America were already full of books by famous writers But Jack London's stories were new ones, his were not like the ones in the books of other writers, and the picture he painted weren't the same as their pictures.
Jack London was born in San Francisco, California, in 1876. He took a high place in American literature at the beginning of the twentieth century At that time, the library shelves and bookshops of America were already full of books by famous writers But Jack London's stories were new one, his were not like the ones in the books of other writers, and the picture he painted weren't the same as their pictures.
Đáp án C
Cụm từ “ take action” ở dòng 13 được dùng để minh họa cho ý kiến rằng Roosevelt đã ..
a- Trình diễn một cách đáng ngưỡng mộ => không liên quan
b- Sử dụng sức lực bản thân => ahihi liên quan nhở
c- Đáp trả ngay lập tức => chuẩn luôn “ Take action” nghĩa là hành động mà
d- Có sự trợ giúp
Fill in the gap with one suitable words
Enrico Rastelli
Enrico Rastelli was probably the greatest juggler the world has ever known. Juggling involves throwing(1)....a.....number of objects up into the air and catching them (2).....without......dropping a single one. Rastelli was able to juggle(3)....as.....many as eight balls at the same time. However,(4)....what......made him a genius was his perfect style, rather(5).......than......the quantity of objects he(6)...could.....juggle.
Rastelli's contributions to juggling were many. He started using rubber balls(7)...instead....of the cotton balls that were(8)......in...use at the time.These rubber balls are now standard. It was Rastelli,too, who began the now commonly seen practice(9).....of.....throwing a ball into the air,and then catching(10)........it....on a stick held in his mouth.
Enrico Rastelli was born into a circus family in Siberia in 1896. Although he spent some of his early years in Italy, it(11)......was.......in Russia that he acquired his juggling skills. It was not uncommon(12).....for...him to practise twelve hours a day, and this dedication was reflected in his astonishing performances. The degree of control shown(13)....by......Enrico Rastelli has never been equalled.
D
Tạm dịch:
“Nếu bố là con, tôi sẽ không bao giờ mở TV lớn giữa đêm.” Người đàn ông nói với cô con gái.
D. Người bố khuyên con gái mình không nên mở TV to tiếng giữa đêm.
Carl was correct
Each year has 12 months and there are 13 commuters on the eastbound subway, so at least there are 2 commuters were born in the same month
~Hok tốt nha~