a) x + \(\dfrac{2}{5}\) = \(\dfrac{1}{2}\)

b) x - \(\dfrac{2}{5}\) = \(\dfrac{2}{7}\)

c) \(\dfrac{3}{5}\) - x = \(\dfrac{1}{10}\)

d) x . \(\dfrac{3}{4}\) = \(\dfrac{9}{20}\)

e) x : \(\dfrac{1}{7}\) = 14

f) ( \(\dfrac{1}{4}\) + x ) . \(\dfrac{1}{2}\) = \(\dfrac{2}{5}\)

g) x . \(\dfrac{2}{3}\) - \(\dfrac{2}{3}\) = \(\dfrac{9}{12}\)

h)  \(\dfrac{3}{4}\) + \(\dfrac{1}{4}\) : x = \(\dfrac{2}{5}\)

k)  \(3\dfrac{4}{5}\) - x = \(\dfrac{18}{5}\)

l)  x . \(2\dfrac{1}{3}\) = \(\dfrac{3}{4}\)

m)  x . \(\dfrac{6}{11}\) + x . \(\dfrac{5}{11}\) = 2025

n)  x . \(\dfrac{14}{9}\) - x . \(\dfrac{7}{9}\) + x . \(\dfrac{5}{9}\) = 2

Các bạn làm theo cách bình thường ở lớp 5 cho mính nhé!

 Chú ý: dấu "." là dấu nhân.

32/21 x 49/45 : 16/22 x 15/33

a) 92/9 + 13/5 - 56/9 

b) 58/7 - (31/9 + 30/7)

c) 2/3 + 1/3 x 9/4 - 13/12

d) 41/8 - 7/4 : 11/5

e) 478/19 : 5/4 - 668/19 : 5/4

f) 32/21 x 49/45 : 16/22 x 15/33

g) 2020x2018+9 / 2019x2020-2011.

Giup minh voi minh dang can gap!!!

15/4 . 2/7 . 4/15 . 7/2

Bài 3: Viết các câu sau ở thế khẳng định (+), phủ định (-) và nghi vấn (?)

1. (+) The girl often listens to pop music.

    (-) _________________________________________

    (?) _________________________________________

2. (+) I am from the capital of Vietnam, Ha noi.

    (-) _________________________________________

   (?) _________________________________________

3. (+) _________________________________________

    (-) My father doesn’t keep the greenhouse warm at night.

    (?) _________________________________________

4. (+) _________________________________________

    (-) _________________________________________

    (?) Does Danny remember to phone his father on Sundays?

5. (+) _________________________________________

    (-) They don’t do their homework after school.

    (?) _________________________________________

Tính hợp lý : 5425 :5+2430:5-3855:5

Viết thêm 3 số hạng vào dãy số sau : e) 1;2;5;11;23;47 f) 2;12;30;56;90