Chọn đáp án đúng:
Tính diện tích hình thoi ABCD biết AC = 5cm, BD = 3cm.
$\dfrac{15}{2}{cm^2}$
$\dfrac{15}{4}{cm^2}$
$\dfrac{10}{4}{cm^2}$
$\dfrac{12}{6}{cm^2}$
A.answer1
B.
C.
D.

Điền giá trị còn thiếu vào bảng theo mẫu:
(rút gọn kết quả về phân số tối giản, sử dụng dấu / cho phân số)
 
Hình thoi MNPQ
Đường chéo MP
Đường chéo NQ
Diện tích
$\dfrac{3} {8}$cm
$\dfrac{2} {6}$cm
cm2
$\dfrac{12} {18}$m
$\dfrac{4} {5}$m
m2
$\dfrac{6} {8}$dm
$\dfrac{5} {6}$dm
dm2
A.1/16
B.4/15
C.5/16
D.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The craftman is getting older, ______ he wants to teach younger labor in the village all the techniques of the craft.
A.although
B.because
C.so
D.that

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The villagers have to dry the buffalo skin under the sun ______ they make the drumheads.
A.in order to
B.during
C.before
D.after

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
In my city, the central park is a place of interest _______ many people want to spend their time there.
A.because of
B.despite
C.because
D.although

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_________ Dong Ho paintings are simple, they reflect typical characteristics in the daily life of the Vietnamese labourers.
A.Although
B.In spite of
C.As
D.Despite

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My mother and I went to Tay Ho village when we were in Hue ______ we could buy some ‘bai tho’ conical hats.
A.because
B.so that
C.before
D.so ... that

Cho dãy các chất : phenol, anilin, natri phenolat, etanol. Số chất trong dãy phản ứng được với NaOH (trong dung dịch) là
A.4
B.2
C.3
D.1

Cho các chất sau:
(1)Metanol
(2)Etanol
(3)Propan-1-ol
(4)2-metylpropan-2-ol
(5)Butan-2-ol
Các chất là ancol bậc (II) là:
A.(4), (5).
B.(5).
C.(1), (2), (3), (4).
D.(2), (3), (4), (5).

Ancol có số nguyên tử C từ C1 đến C12 tồn tại ở thể?
A.Lỏng
B.Khí
C.Không xác định.
D.Rắn