= 18.( 36/72 - 23/92 )

=18. 1/4

= 9/2

A = \(\dfrac{9292\times939393}{929292\times9393}\) + 1,1 + 1,2 + 1,3 +...+ 8,8 + 8,9 + 9

A = \(\dfrac{92\times101\times93\times10101}{92\times10101\times93\times101}\) + (9 + 1,1) \(\times\) {(9 - 1,1):0,1 + 1}: 2 

A = 1 + 10,1\(\times\)80: 2

A = 1 + 404

A = 405

\(\frac{1919}{2323}.\frac{4646}{7474}.\frac{37}{19}\)

\(=\frac{19}{23}.\frac{23}{37}.\frac{37}{19}\)

\(=\frac{19.23.37}{23.37.19}\)

\(=1\)

_Chúc bạn học tốt_

ta có:

 \(\frac{1919}{2323}=\frac{19}{23}\)

\(\frac{4646}{7474}=\frac{46}{74}\)

=> \(\frac{1919}{2323}\cdot\frac{4646}{7474}.\frac{37}{19}=\frac{19}{23}\cdot\frac{46}{74}\cdot\frac{37}{19}\)= \(\frac{19}{23}\cdot\frac{2\cdot23}{37\cdot2}\cdot\frac{37}{19}\)= 1

= 1 nhé bạn

\(A=\dfrac{121212}{131313}+\dfrac{154154}{143143}-\left(\dfrac{2121}{2323}+\dfrac{275275}{253253}\right)\)

\(=\dfrac{12}{13}+\dfrac{14}{13}-\left(\dfrac{21}{23}+\dfrac{25}{23}\right)\)

\(=2-2=0\)

19/23*23/37*37/19=1

tôi thách cả bố ban\(\frac{2+5+\frac{525}{5\cdot25\cdot5-45-5-56+2+5\cdot5\cdot54-4\cdot\frac{4}{5\cdot5-5-45-45-4-4\cdot5\cdot\frac{45}{\frac{4}{5\cdot5-\cdot4\cdot4-4-4\cdot-5\cdot\frac{4}{4}}}}}}{ }\)

bằng 1 con ngu tao làm được thì sao

26,72 :18 + 63,28 :18=18:(26,72+ 63,28)

                                  =18:100

                                  =0,18

\(=\left(26,72+63,28\right):18=90:18=5\)

= ( 63,28 + 26,72 ) : 18

= 100 : 18

= \(\dfrac{50}{9}\)

= ( 18 : 9) x 50

= 2 x 50

= 100

\(\left(50\times18\right):9\\ 50\times18:9\\ =50\times\left(18:9\right)\\ =50\times2\\ =100\)

(50 x 18) : 9 

= (18 : 9 ) x 50

= 2 x 50

= 100

`9/14+19/18+19/14+35/18`

`=(9/14+19/14)+(19/18+35/18)`

`=28/14+54/18`

`=2+3`

`=5`