\(a,\frac{8}{9}-\frac{1}{3}\div\frac{1}{2}\)

\(=\frac{8}{9}-\frac{1}{3}\times\frac{1}{2}\)

\(=\frac{8}{9}-\frac{1}{6}\)

\(=\frac{13}{18}\)

\(b,\left(\frac{3}{10}+\frac{4}{5}\times\frac{1}{2}\right)\div\left(\frac{17}{9}-\frac{4}{3}\right)\)

\(=\left(\frac{3}{10}+\frac{2}{5}\right)\div\frac{5}{9}\)

\(=\frac{7}{10}\div\frac{5}{9}=\frac{63}{50}\)

2, Chiều dài mảnh đất là:

\(\frac{25}{4}\div\frac{5}{4}=5\left(m\right)\)

Chu vi mảnh đất là:

\(\left(5+\frac{5}{4}\right)\times2=\frac{25}{2}\left(m\right)\)

                                      \(Đs:...\)

Bài 1:

\(a,\frac{8}{9}-\frac{1}{3}:\frac{1}{2}\)

=\(\frac{8}{9}-\frac{2}{3}\)

=\(\frac{2}{9}\)

\(b,\left(\frac{3}{10}+\frac{4}{5}x\frac{1}{2}\right):\left(\frac{17}{9}-\frac{4}{3}\right)\)

=\(\left(\frac{3}{10}+\frac{4}{10}\right):\frac{5}{9}\)

=\(\frac{7}{10}:\frac{5}{9}\)

=\(\frac{63}{50}\)

Bài 2:

Chiều dài của mảnh đất hình chữ nhật đó là:

          \(\frac{25}{4}:\frac{5}{4}=5\left(m^2\right)\)

Chu vi của mảnh đất hình chữ nhật đó là:

            \(\left(\frac{5}{4}+5\right)x2=\frac{25}{2}\left(m\right)\)

                                      Đáp số:\(\frac{25}{2} \left(m\right)\)

Bài 1:

A . 
8/9 - 1/3 : 1/2 

= 8/9 - 1/3 x 2/1

= 8/9 - 2/3

= 8/9 - 6/9

= 2/9

B . 

( 3/10 + 4/5 x 1/2 ) : ( 17/9 - 4/3 )

= ( 3/10 + 4/5 ) x 1/2 : ( 17/9 - 4/3 )

=   11/10 x 1/2 : 5/9

= 11/20 : 5/9

= 55/180

= 11/36

Bài 2 :

Chiều dài hình chữ nhật là :

25/4 : 5/4 = 5 ( m )

Chu vi hình chữ nhật là :

( 5/4 + 5 ) x 2 =12,5 ( m )

Đáp số : 12,5 m

\(\dfrac{4}{5}-\dfrac{2}{5}\times\dfrac{1}{4}=\dfrac{4}{5}-\dfrac{1}{10}=\dfrac{8}{10}-\dfrac{1}{10}=\dfrac{7}{10}\)

\(\dfrac{1}{4}+\dfrac{3}{4}:\dfrac{1}{8}=\dfrac{1}{4}+\dfrac{3}{4}\times8=\dfrac{1}{4}+6=\dfrac{1}{4}+\dfrac{24}{4}=\dfrac{25}{4}\)

\(\)\(\dfrac{11}{10}-\dfrac{2}{5}:\dfrac{1}{3}=\dfrac{11}{10}-\dfrac{2}{5}\times3=\dfrac{11}{10}-\dfrac{6}{5}=\dfrac{11}{10}-\dfrac{12}{10}=-\dfrac{1}{10}\)

4/5-2/5.1/4

=4/5-1/10

=8/10-1/10

=7/10

1/4+3/4:1/8

=1/4+3/4.8

=1/4+6

=1/4+24/4

=25/4

11/10-2/5:1/3

=11/10-2/5.3

=11/10-6/5

=11/10-12/10

=-1/10

\(\dfrac{4}{5}-\dfrac{2}{5}x\dfrac{1}{4}=\dfrac{4}{5}-\dfrac{2}{20}=\dfrac{16}{20}-\dfrac{2}{20}=\dfrac{14}{20}=\dfrac{7}{10}\)

\(\dfrac{1}{4}+\dfrac{3}{4}:\dfrac{1}{8}=\dfrac{1}{4}+\dfrac{3}{4}x\dfrac{8}{1}=\dfrac{25}{4}\)

\(\dfrac{11}{10}-\dfrac{2}{5}:\dfrac{1}{3}=\dfrac{11}{10}-\dfrac{2}{5}x\dfrac{3}{1}=\dfrac{11}{10}-\dfrac{6}{5}=\dfrac{11}{10}-\dfrac{12}{10}=-\dfrac{1}{10}\)

a, (3/10+4/5 ><1/2):(17/9-4/3:3)

= (3/10+4/10):(17/9-4/9)

=7/10:13/9

=7/10><9/13

=63/130

(>< là dấu nhân)

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

ủa bạn tìm j zo

mk thấy co kết  qủa rồi mà

\(M=\frac{1}{2}:\left(\frac{1}{3}:\frac{1}{4}:\frac{1}{5}\times\frac{1}{120}\right)=2008\)

\(M=\frac{1}{2}:\left(\frac{1}{3}\times\frac{4}{1}\times\frac{5}{1}\times\frac{1}{120}\right)=2008\)

\(M=\frac{1}{2}:\left(\frac{4}{3}\times\frac{1}{1}\times\frac{1}{24}\right)=2008\)

\(M=\frac{1}{2}:\left(\frac{4}{3}\times\frac{1}{24}\right)=2008\)

\(M=\frac{1}{2}:\left(\frac{1}{3}\times\frac{1}{6}\right)=2008\)

\(M=\frac{1}{2}:\frac{1}{18}=2008\)

\(M=\frac{1}{2}\times\frac{18}{1}=2008\)

\(M=\frac{18}{2}=2008\)

\(M=9=2008\)

tích đúng mình giải cho

= 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5 x 6

= (1 - 1/2) + (1/2 - 1/3) + (1/3 - 1/4) + (1/4 - 1/5) + (1/5 - 1/6)

= 1 - 1/6

= 5/6

nha,mơn nhìu

\(\frac{1}{1}x\frac{1}{2}+\frac{1}{2}x\frac{1}{3}+\frac{1}{3}x\frac{1}{4}+\frac{1}{4}x\frac{1}{5}+\frac{1}{5}x\frac{1}{6}\)

\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)

\(=1-\frac{1}{6}=\frac{5}{6}\)