Cho tam giác $ ABC $ có chu vi $ 18cm $ , các đường phân giác $ BD $ và $ CE $ . Tính các cạnh của tam giác $ ABC $ , biết $ \dfrac{AD}{DC}=\dfrac{1}{2},\dfrac{AE}{EB}=\dfrac{3}{4} $ .
A. $ AC=4cm,BC=8cm,AB=6cm $ .
B. $ AB=4cm,BC=6cm,AC=8cm $ .
C. $ AB=8cm,BC=4cm,AC=6cm $ .
D. $ AB=4cm,BC=8cm,AC=6cm $ .

Cho tam giác $ ABC $ , có $ AB=5cm;AC=8,5cm $ . Đường phân giác trong của góc A cắt BC tại D. Biết $ BD=4cm $ , khi đó chu vi tam giác $ ABC $ bằng
A.$ 22,6cm $.
B.$ 21,5cm $.
C.$ 24,3cm $.
D.$ 21,3cm $.

Cho tam giác $ ABC $ , có $ AB=4cm;AC=6cm $ . Đường phân giác trong của góc A cắt BC tại D. Biết $ BD=2cm $ , khi đó $ DC $ bằng
A.$ 3cm $.
B.$ 5cm $.
C.$ 2cm $.
D.$ 4cm $.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Elementary schools in the United states provide formal education ______ arithmetic, science, social science, and communication skills that including reading, writing, spelling, and speaking.
A.as basic subjects in such
B.as in such basic subjects
C.such subjects as basic in
D.in such basic subjects as

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
________ in astronomy, the discovery of Uranus was by accident.
A.Like many finds
B.Many alike finds
C.Alike many finds
D.It was like many finds

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
It was _________ an interesting speech that everyone stayed till the end.
A.very
B.too
C.so
D.such

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I'm sorry, but I've got__________much work to do to come to the beach today.
A.so
B.such
C.enough
D.too

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Computers that once took up entire rooms are now ________ to put on desktops and into wristwatches.
A.smaller than
B.so small
C.small enough
D.as small as

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Is there_____ for everyone?
A.enough food and drink
B.enough of food and drink
C.food and drink enough
D.enough food and drink enough

Choose the letter A, B, C or D to indicate the best answer to the following question.
______ other mammals, whales do not have a sense of smell.
A.Not alike
B.Unlike
C.Dislike
D.Unlikely