\(\dfrac{12}{7}\) \(\times\) \(\dfrac{3}{4}\) - \(\dfrac{3}{4}\) \(\times\) \(\dfrac{12}{7}\)

= \(\dfrac{9}{7}\) - \(\dfrac{9}{7}\)

= 0 

\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)

\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)

hình như có vấn đề ở 9/14 x 21 đáng lẽ là 9/14 x 23 chứ 

A = \(2000-\left\{46-\left[24+74.4\right]:15\right\}\)

A = \(2000-\left\{46-\left[24+296\right]:15\right\}\)

A = \(2000-\left\{46-320:15\right\}\)

A = \(2000-\left(46-\frac{64}{3}\right)\)

A = \(2000-\left(\frac{138}{3}-\frac{64}{3}\right)\)

A = \(2000-\frac{74}{3}\)

A = \(\frac{6000}{3}-\frac{74}{3}\)

A = \(\frac{5926}{3}\)

`(3/4 +1/2): 3/4`

`=(3/4 +2/4) xx 4/3`

`= 5/4 xx 4/3`

`=20/12`

`= 5/3`

`-----`

`(3/4 +1/2) : 3/4`

`= 3/4 : 3/4 + 1/2 : 3/4`

`= 1 + 1/2 xx 4/3`

`=1+ 2/3`

`= 3/3+2/3`

`=5/3`

20/24

a mink la nguoi gui cau hoi minh co mot chu y la ra so tu nhien nha mn

cam on

Bạn ơi, Bạn thiếu 1 dấu ngoặc vuông rồi, cho lại đề bài đi.Thiếu một cái là có thể làm sai đấy.

\(=\frac{32+16+8+4+2+1}{64}=\frac{63}{64}\)

`( 5/6 -1/2 ) : 2/3`

`= ( 5/6 - 3/6) xx 3/2`

`= 1/3 xx 3/2`

`= 3/6`

`=1/2`

`@ `

`(5/6-1/2) : 2/3`

`= 5/6 : 2/3 - 1/2 : 2/3`

`= 5/6 xx 3/2 - 1/2 xx 3/2`

`= 15/12 - 3/4`

`= 5/4 -3/4`

`= 2/4`

`=1/2`

`------`

`(3/4 +1/2) : 3/5`

`= ( 3/4 + 2/4) xx 5/3`

`= 5/4 xx 5/3`

`= 25/12`

`@ `

`(3/4 + 1/2) : 3/5`

`= 3/4 : 3/5 + 1/2 : 3/5`

`= 3/4 xx 5/3 + 1/2 xx 5/3`

`= 5/4 + 5/6`

`=25/12`