\(\left(\frac{5}{12}+\frac{1}{2}.\frac{1}{3}\right):\left(2.\frac{1}{3}-1.\frac{5}{12}\right)\)

\(=\left(\frac{5}{12}+\frac{1}{6}\right):\left(\frac{2}{3}-\frac{5}{12}\right)\)

\(=\frac{7}{12}:\frac{1}{4}\)

\(=\frac{7}{3}\)

_Chúc bạn học tốt_

Đề bài 

= ( 5/12 +    1/6 ) : (    2/3 - 1/12 ) 

= ( 5/12 + 2/12 ) :   ( 8/12 - 1/12 ) 

= 7/12 : 7/12 

= 1 

K Trắng nha .

=1 nha

\(\left(\frac{5}{12}+\frac{1}{2}\times\frac{1}{3}\right):\left(2\times\frac{1}{3}-1\times\frac{1}{12}\right)\)

\(=\left(\frac{5}{12}+\frac{1}{6}\right):\left(\frac{2}{3}-\frac{1}{12}\right)\)

\(=\frac{7}{12}:\frac{7}{12}\)

\(=1\)

k bk tính nhanh!

1234567890

\(\dfrac{1}{2}\times\dfrac{1}{3}+\dfrac{2}{3}+\dfrac{1}{2}\)
\(=\dfrac{1}{6}+\dfrac{2}{3}+\dfrac{1}{2}\)
\(=\dfrac{1}{6}+\dfrac{4}{6}+\dfrac{3}{6}\)
\(=\dfrac{8}{6}=\dfrac{4}{3}\)

\(\dfrac{1}{24}\)

\(\dfrac{1}{2}.\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{1}{6}-\dfrac{1}{8}=\dfrac{4}{24}-\dfrac{3}{24}=\dfrac{1}{24}\)

1/24

1/2x1/3+1/3-1/4+1/4x1/5

= 1/2-1/3+1/3-1/4+1/4-1/5

=1/2-1/5

=3/10. (1/2x1/3= 1/2x3) 

1/2x1/3+1/3-1/4+1/4x1/5 = 1/2-1/3+1/3-1/4+1/4-1/5 =1/2-1/5 =3/10. (1/2x1/3= 1/2x3)

\(\left(\dfrac{1}{3}\right)^2\cdot\dfrac{1}{3\cdot9^2}=\dfrac{1}{9\cdot3\cdot9^2}=\dfrac{1}{3^7}\)

`1/5xx1/2:3/10`

`=1/10xx10/3`

`=1/3`

`1/2xx1/3:1/4`

`=1/6xx4/1`

`=2/3`

a. \(\dfrac{1}{5}\times\dfrac{1}{2}:\dfrac{3}{10}=\dfrac{1}{10}:\dfrac{3}{10}=\dfrac{1}{10}\times\dfrac{10}{3}=\dfrac{10}{30}=\dfrac{1}{3}\)

b. \(\dfrac{1}{2}\times\dfrac{1}{3}:\dfrac{1}{4}=\dfrac{1}{6}:\dfrac{1}{4}=\dfrac{1}{6}\times\dfrac{4}{1}=\dfrac{4}{6}=\dfrac{2}{3}\)

a) \(\dfrac{1}{5}\times\dfrac{1}{2}:\dfrac{3}{10}=\dfrac{1}{5}\times\dfrac{1}{2}\times\dfrac{10}{3}=\dfrac{1\times1\times10}{5\times2\times3}=\dfrac{10}{30}=\dfrac{1}{3}\)

b) \(\dfrac{1}{2}\times\dfrac{1}{3}:\dfrac{1}{4}=\dfrac{1}{2}\times\dfrac{1}{3}\times4=\dfrac{1\times1\times4}{2\times3}=\dfrac{4}{6}=\dfrac{2}{3}\)

x + 1/2 x 1/3 = 3/4

x  +    1/6     = 3/4

x                 =  3/4 - 1/6

x                 = 7/12

7/12 nha bạn 

x + 1/2 x 1/3 = 3/4

x  +    1/6     = 3/4

x                 =  3/4 - 1/6

x                 = 7/12