\(X:\dfrac{3}{9}=\dfrac{7}{8}\)

\(X=\dfrac{7}{8}\times\dfrac{3}{9}\)

\(X=\dfrac{21}{72}\)

\(\left(X-21\times13\right):11=30\)

\(X-273=330\)

\(X=603\)

`x:3/9=7/8`

`x=7/8xx3/9`

`x=7/24`

`-------------`

`(x-21xx13):11=30`

`(x-273):11=30`

`x-273=30xx11`

`x-273=330`

`x=330-273`

`x=57`

x+30%x=-1,31

x+0,3=-1,31

x=-1,31-0,3

x=-1,61

Thắng Mai bảo t k cho m

x + \(\frac{3}{10}\)x - -1,31

x . ( \(1\)+ \(\frac{3}{10}\)) = -1,31

x . \(\frac{13}{10}\)= -1,31

x                = -1,31 : \(\frac{13}{10}\)

x               = \(\frac{-131}{130}\)

ai tốt bụng thì tk cho mk nha, mk đg âm điểm nè

thank you very much

\(\frac{-131}{130}\)bạn nha

CHÚC BẠN HỌC GIỎI

\(x+30\%x=-1,31\\ x+\dfrac{3}{10}x=-1\dfrac{31}{100}\\ x\cdot\left(1+\dfrac{3}{10}\right)=-\dfrac{131}{100}\\ x\cdot\dfrac{13}{10}=-\dfrac{131}{100}\\ x=-\dfrac{131}{100}:\dfrac{13}{10}=\dfrac{-131}{100}\cdot\dfrac{10}{13}=-\dfrac{131}{130}\)

x + 30%x = - 1,31

1,3 x = - 1,31

x = -131/130

131/130

k nha

       x + 30% x = -1,31

<=> x + 3/10 x = -32/31

<=>1x + 3/10 x=-32/31

<=> 10/10 x + 3/10 x = -32/31

<=> x . 13/10 = -32/31

=> x= -32/31 : 13/10=.....?

8.75x + 10 = 30 + 1.26x

8.49x + 10 = 30 

8 . 49x = 30 - 10

8 . 49x = 20

49x = 20 : 8

49x = 2.5

x = 2.5 : 49

x = 5/98

xin lỗi;số 1.26x phải la136x mình chép nhầm đề

\(\dfrac{x}{5}=\dfrac{5}{6}-\dfrac{19}{30}\)

\(\Leftrightarrow\dfrac{x}{5}=\dfrac{25}{30}-\dfrac{19}{30}=\dfrac{6}{30}=\dfrac{1}{5}\)

\(\Leftrightarrow x=1\)

Ta có : \(\dfrac{x}{5}=\dfrac{5}{6}+\left(-\dfrac{19}{30}\right)=\dfrac{25}{30}-\dfrac{19}{30}=\dfrac{1}{5}\)

\(\Leftrightarrow5x=5\)

\(\Leftrightarrow x=1\)

Vậy ...

Ta có: \(\dfrac{x}{5}=\dfrac{5}{6}-\dfrac{19}{30}\)

\(\Leftrightarrow\dfrac{x}{5}=\dfrac{25}{30}-\dfrac{19}{30}\)

\(\Leftrightarrow\dfrac{x}{5}=\dfrac{6}{30}=\dfrac{1}{5}\)

hay x=1

Vậy: x=1

\(x+\dfrac{30}{100}.x=-1,31\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x.\left(1+\dfrac{30}{100}\right)=\dfrac{-131}{100}\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x.\left(\dfrac{100}{100}+\dfrac{30}{100}\right)=\dfrac{-131}{100}\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x.\dfrac{26}{20}=\dfrac{-131}{100}\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\\\ \\ x=\dfrac{-131}{100}:\dfrac{26}{20}=\dfrac{-131}{100}.\dfrac{20}{26}\\ \\ \\ \\ \\ \\ \\ \\ \\\\ \\ x=\dfrac{-131}{130}\)

coi chừng mình làm sai nhưng trinh bày mình đúng nhưng cẩn thận kết quả. nhé bye

x+\(\dfrac{30}{100}\).x=-1,31

x+0,3.x=-1,31

x.(0,3+1)=-1,31

x.1,3=-1,31

x=-1,31:1,3

x=\(\dfrac{-131}{130}\)

Vậy x=\(\dfrac{-131}{130}\)

Chúc bạn học tốt nha

x+\(\dfrac{30}{100}\).x=-1,31

x.1+\(\dfrac{30}{100}\)x=\(\dfrac{-131}{100}\)

x(1+\(\dfrac{30}{100}\))=\(\dfrac{-131}{100}\)

x(\(\dfrac{100}{100}\)+\(\dfrac{30}{100}\))=\(\dfrac{-131}{100}\)

x.\(\dfrac{130}{100}\)=​​​\(\dfrac{-131}{100}\)​

x=\(\dfrac{-131}{100}\):\(\dfrac{130}{100}\)

x=\(\dfrac{130}{100}\).\(\dfrac{100}{131}\)

x=\(\dfrac{100.130}{131.100}\)

x=\(\dfrac{130.1}{131.1}\)

x=\(\dfrac{130}{131}\)