a) y - 6 chia 2 - ( 48 - 24 x 2 chia 6 - 3 ) = 0

=> y - 6 chia 2 - ( 48 - 48 chia 6 - 3 ) = 0 

=> y - 6 chia 2 - (  48 - 8 -3 ) = 0

= > y - 6 chia 2 - 37 = 0

=> y - 6 chia 2 = 0 + 37 

=> y - 6 chia 2 = 37

=> y -6 = 37 chia 2 

=> y - 6 = 37 / 2

=> y = 37 / 2    +  6

=> y = 49 / 2

Vậy y = 49 / 2

b) ( 7 x 13 + 8 x 13 ) chia ( 92 /3-y ) = 39

=> ( 91  +   104 ) chia ( 92/3 - y ) =39

=> 195 chia  ( 92 /3 - y ) = 39

=> 92/3 - y = 7605 

=>           y = 7605 + 92/3 

=>           y = 22907 /3

Vậy y = 22907 / 3

\(\dfrac{7.13+8.13}{9\dfrac{2}{3}-y}=39\)

=> \(\dfrac{13.\left(7+8\right)}{\dfrac{29}{3}-y}=39\)

=> \(\dfrac{13.15}{\dfrac{29}{3}-y}=39\)

=> \(\dfrac{195}{\dfrac{29}{3}-y}=39\)

=> \(\dfrac{29}{3}-y=5\)

=> y = \(\dfrac{14}{3}\)

@Bùi Thị Phương Anh

\(\dfrac{7.13+8.13}{9\dfrac{2}{3}-y}=39\)

\(\Leftrightarrow\dfrac{13\left(7+8\right)}{\dfrac{29}{3}-y}=39\)

\(\Leftrightarrow\dfrac{13.15}{\dfrac{29}{3}-y}=39\)

\(\Leftrightarrow\dfrac{195}{\dfrac{29}{3}-y}=39\)

\(\Leftrightarrow\dfrac{29}{3}-y=39\)

\(\Leftrightarrow y=\dfrac{14}{3}\)

Vậy ....

Dấu \(.\)là dấu nhân 

\(\left(7.13+8.13\right):\left(9\frac{2}{3}-y\right)=39\)

\(\Rightarrow13.\left(7+8\right):\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow13.15:\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow195:\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow\frac{29}{3}-y=195:39\)

\(\Rightarrow\frac{29}{3}-y=5\)

\(\Rightarrow y=\frac{29}{3}-5\)

\(\Rightarrow y=\frac{29}{3}-\frac{15}{3}\)

\(\Rightarrow y=\frac{14}{3}\)

Vậy \(y=\frac{14}{3}\)

~ Ủng hộ nhé . 

P/s : Đúng nha 

\(\left[7\times13+8\times13\right]:\left[9\frac{2}{3}-y\right]=39\)

\(\left[\left(7+8\right)\times13\right]:\left[\frac{29}{3}-y\right]=39\)

\(\left[15\times13\right]:\left[\frac{29}{3}-y\right]=39\)

\(195:\left[\frac{29}{3}-y\right]=39\)

\(\frac{29}{3}-y=195:30\)

\(\frac{29}{3}-y=\frac{13}{2}\)

\(y=\frac{29}{3}-\frac{13}{2}\)

\(y=\frac{19}{6}\)

Học tốt #

[ 7 x 13 + 8 x 13 ] : [ \(9\frac{2}{3}\) - y ] = 39

[ 13 x ( 7 + 8 )]     :  [ \(9\frac{2}{3}\)- y  ]  = 39

[ 13 x 15 ]            :  [\(9\frac{2}{3}\) - y  ]   = 39

195                      : [\(\frac{29}{3}\)  - y  ]   = 39

                              [ \(\frac{29}{3}\) - y  ]   = 195 : 39 (^*1 )

                              [\(\frac{29}{3}-y\)]  = 5

                            y                         = \(\frac{29}{3}-5\)

                           y                          = \(\frac{14}{3}\)

\(\left(7.13+8.13\right)\div\left(9\frac{2}{3}-y\right)=39\)

\(\Rightarrow\left(91+104\right)\div\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow195\div\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow\frac{29}{3}-y=195\div39\)

\(\Rightarrow\frac{29}{3}-y=5\)

\(\Rightarrow y=\frac{29}{3}-5\)

\(\Rightarrow y=\frac{14}{3}\)

Vậy \(y=\frac{14}{3}\)

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mình ko tích lại đâu

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ai tích mình

mình tích lại

thanks

\(\left(7\times13+8\times13\right)\div\left(9\frac{2}{3}-x\right)=39\)

\(\left[\left(7+8\right)\times13\right]\div\left(\frac{29}{3}-x\right)=39\)

\(\left(15\times13\right)\div\left(\frac{29}{3}-x\right)=39\)

\(195\div\left(\frac{29}{3}-x\right)=39\)

\(\frac{29}{3}-x=195\div39\)

\(\frac{29}{3}-x=5\)

\(x=\frac{29}{3}-5\)

\(x=\frac{29}{3}-\frac{15}{3}\)

\(x=\frac{14}{3}\)

a) \(y-6:2-\left(48-24.2:6-3\right)=0.\)

\(\Rightarrow y-3-\left(48-8-3\right)=0\)

\(\Rightarrow y-3-37=0\)

\(\Rightarrow y=0+37+3=40\)

Vậy y = 40

b) \(\left(7.13+8.13\right):\left(9\frac{2}{3}-y\right)=39\)

\(\Rightarrow195:\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow\frac{29}{3}-y=195:39=5\)

\(\Rightarrow y=\frac{29}{3}-5=\frac{14}{3}\)

Vậy y=\(\frac{14}{3}\)

a) y - 6 : 2 - ( 48 - 24 x 2 : 6 - 3 ) = 0

y - 6 : 2 - ( 48 - 48 : 6 - 3 ) = 0

y - 6 : 2 - ( 48 - 8 - 3 ) = 0

y - 6 : 2 - 37 = 0

y - 3 = 0 + 37

y - 3 = 37

y = 37 + 3

y = 40

b) ( 7 x 13 + 8 x 13 ) : (  \(9\frac{2}{3}\) - y ) = 39

( 15 x 13 ) : ( \(9\frac{2}{3}\) - y ) = 39

195 : ( \(9\frac{2}{3}\) - y ) = 39

\(9\frac{2}{3}\) - y = 195 : 39

\(9\frac{2}{3}-y=5\)

\(y=9\frac{2}{3}-5\)

\(y=\frac{14}{3}\)

 a,  y - 6 : 2 - ( 48 - 24 x 2 : 6 - 3 ) = 0 

     y - 3 - 37 = 0 

     y - 3 = 0 + 37 

     y - 3 = 37 

     y = 37 + 3

     y = 40 

b,  ( 7 x 13 + 8 x 13 ) : ( \(9\frac{2}{3}\) - y ) = 39

     195 : ( \(\frac{29}{3}\)- y ) = 39 

     \(\frac{29}{3}\)- y = 195 : 39 

   \(\frac{29}{3}\)- y = 5

  y = \(\frac{29}{3}\)- 5 

y = \(\frac{14}{3}\)

`@` `\text {Ans}`

`\downarrow`

`1,`

`a)`

`-7/25 + (-8)/25`

`= (-7 - 8)/25`

`= -15/25`

`= -3/5`

`b)`

`6/13 + (-15)/39`

`= 18/39 + (-15)/39`

`= (18 - 15)/39`

`= 3/39`

`= 1/13`

`c)`

`5/7 + 4/(-14)`

`= 10/14 + (-4)/14`

`= (10 - 4)/14`

`= 6/14`

`= 3/7`

`d)`

`-8/18 + (-15)/27`

`= -4/9 + (-5)/9`

`= (-4-5)/9`

`= -9/9 = -1`

`2,`

`a)`

`3/5 + (-7)/4`

`= 12/20 + (-35)/20`

`= (12 - 35)/20`

`=-23/20`

`b)`

`(-2) + (-5)/8`

`= (-16)/8 + (-5)/8`

`= (-16 - 5)/8`

`= -21/8`

`c)`

`1/8 + (-5)/9`

`= 9/72 + (-40)/72`

`= (9-40)/72`

`= -31/72`

`d)`

`6/13 + (-14)/39`

`= 18/39 + (-14)/39`

`= (18 - 14)/39`

`= 4/39`

`e)`

`(-18)/24 + 15/21`

`= (-3)/4 + 5/7`

`= (-21)/28 + 20/28`

`= (-21 + 20)/28`

`= -1/28`