đề bài chắc là tìm x

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Ai biết chỉ mình nha 

1. 11(x-9)=77

x-9=7

x=16

2. 4(x-3)=48

x-3=12

x=15

3.3(x-8)=81

(x-8)=27

x=35

\(x-\dfrac{-3}{4}=\dfrac{-14}{25}\)

\(x=\dfrac{-14}{25}+\dfrac{-3}{4}\)

\(x=-0,56+\left(-0,75\right)\)

\(x=-1,31\)

\(x=-\dfrac{131}{100}\)

=>x+3/4=-14/25

=>x+0,75=-0,56

=>x=-0,56-0,75=-1,31

14 phút 25 giây x 4= 57 phút

4 phút 25 giây × 4 = 17 phút 40 giây 

x=3

[ 81-(64+14):13]:x=25

[81-78:13]:x=25

[81-6]:x=25

75:x=25

x=75:25

x=3

\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)

` 1, 5 . ( -2/25 = 3/2 . (-2)/25 = -6/50 = -3/25 `

` 1 3/5 . (-3)/4 = 8/5 . (-3)/4 = -24/20 = -6/5 `

`-15/4 : 21/(-1) = -15/4 . (-1)/21 = 15/84 = 5/28 `

` ( -2 1/7 ) : ( -1 1/14 ) = (-15)/7 : (-15)/14 = -15/7 . (-14)/15 =  210/105 = 2 ` 

`@animephamdanhv.`

giúp với

 1) 9-25=(7-x)-(25+7)

(7-x)-(25+7)=9-25

(7-x)-(25+7)=-16

(7-x)-32=-16

7-x=-16+32

7-x=16

x=7-16

x=-9

2) (27-514) -(486-73)+x=7

 (27-514) -(486-73)+x=7

-487-413+x=7

-1011+x=7

x=7-(-1011)

x=7+1011

x=1018

3) 25+5+37-25+6-29-x=37

 25+5+37-25+6-29-x=37

67-25+6-29-x=37

42+6-29-x=37

48-29-x=37

19-x=37

x=19-37

x=-18

4) 14+(-12)+x =10-/-15/+ /-3/

14+(-12)+x =10-15+3

14+(-12)+x =-5+3

14+(-12)+x =-2

2+x=-2

x=-2-2

x=-4

1) - 9

2) 1018 

3) -18 

4) -4

tick nha

Ta có: \(\left(3+\frac{31}{33}\right)\times\left(4+\frac{11}{4}\right)\times\frac{25}{35}\times\frac{11}{195}\times\frac{81}{134}\times\left(5+\frac49\right)\)

\(=\frac{130}{33}\times\frac{1}{195}\times\frac{27}{4}\times\frac{81}{134}\times\frac57\times\frac{49}{9}\)

\(=\frac{2}{3\times33}\times\frac{27}{4}\times\frac{81}{134}\times5\times\frac79=\frac{2}{9\times11}\times\frac{27}{4}\times\frac{81}{134}\times\frac{35}{9}\)

\(=\frac{2\times3}{4\times11}\times\frac{81}{134}\times\frac{35}{9}=\frac{3}{22}\times\frac{9}{134}\times35=\frac{945}{2948}\)