Điền số thích hợp vào ô vuông: 

a) \(\dfrac{1}{2}\)=\(\dfrac{ }{12}\)                       b)\(\dfrac{ }{8}\)=\(\dfrac{-28}{32}\)                        c)\(\dfrac{3}{4}\)=\(\dfrac{ }{20}\)           

            d)\(\dfrac{ }{9}\)=\(\dfrac{-16}{36}\)                                 e)\(\dfrac{3}{4}\)=\(\dfrac{15}{ }\)

2. Điền ký hiêụ ( \(\in\), \(\notin\), \(\subset\) ) thích hợp vào ô vuông:

- 5 ❏ N        - 5 ❏ Z           - 5 ❏ Q           \(-\dfrac{6}{7}\)  ❏ Z              \(-\dfrac{6}{7}\) ❏ Q           N ❏ Q

Điền dấu thích hợp (>,<,=) vào chỗ trống.

a,\(\dfrac{-6}{11}+\dfrac{5}{-11}....--1\)            b.\(\dfrac{-5}{16}+\dfrac{-3}{16}...\dfrac{-1}{3}\)

c,\(\dfrac{2}{5}...\dfrac{3}{4}+\dfrac{-1}{6}\)              d,\(\dfrac{5}{6}+\dfrac{-2}{3}...\dfrac{1}{12}+\dfrac{-4}{5}\)

Giúp mk nha :>>. Mk cảm ơn.

Thực hiện phép tính (hợp lý nếu có thể):

\(\dfrac{\text{1}}{\text{2}}\). (\(\dfrac{\text{4}}{\text{3}}\) + \(\dfrac{\text{2}}{\text{5}}\text{ }\)) - \(\dfrac{\text{3}}{\text{4}}\text{ }\). (\(\dfrac{\text{8}}{\text{9}}\) + \(\dfrac{\text{16}}{\text{3}}\))

\(\text{Tìm x, biết:}\)

\(a\)) \(20\text{%}x-x+\dfrac{1}{5}=\dfrac{3}{4}\)

\(b\)) \(\dfrac{2x+1}{3}=\dfrac{x-5}{2}\)

\(c\)) \(\left(x-\dfrac{3}{4}\right)\left(4+3x\right)=0\)

\(d\)) \(x-\dfrac{1}{3}x+\dfrac{1}{5}x=\dfrac{-26}{5}\)

\(e\)) \(50\text{%}x+\dfrac{2}{3}x=x-5\)

\(g\)) \(\dfrac{2}{3}\left(x+\dfrac{9}{5}\right)-\dfrac{3}{10}.\left(5x-\dfrac{1}{3}\right)=\dfrac{7}{15}\)