x+30%.x=-1,3

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

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

=>x.1,3=-1,3

=>x=-1,3:1,3

=>x=-1

x+30%.x=-1,3

x+1/3.x=-1,3

x(1+1/3)=-13/10

x.4/3=-13/10

x= (-13/10) : (4/3)

x=-39/40

Ungr hộ mk nha

-39/40

Trả lời :

\(x+30\%\cdot x=-\frac{1}{3}\)

\(x+\frac{3}{10}\cdot x=-\frac{1}{3}\)

\(x\left(1+\frac{3}{10}\right)=-\frac{1}{3}\)

\(\frac{13}{10}x=-\frac{1}{3}\)

\(x=-\frac{1}{3}:\frac{13}{10}\)

\(x=-\frac{10}{39}\)

Vậy \(x=-\frac{10}{39}\)

Hok tốt

-Ken-

\(x+30\%x=-1,3\)

\(\Leftrightarrow1x+\frac{30}{100}x=-1,3\)

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

\(\Leftrightarrow x\left(\frac{10}{10}+\frac{3}{10}\right)=-1,3\)

\(\Leftrightarrow\frac{13}{10}x=\frac{-13}{10}\)

\(\Leftrightarrow x=\frac{-13}{10}\div\frac{13}{10}\)

\(\Leftrightarrow x=\frac{-13}{10}\times\frac{10}{13}\)

\(\Leftrightarrow x=-1\)

\(x+30\%\cdot x=-1,3\)

\(100\%\cdot x+30\%\cdot x=-1,3\)

\(x\cdot\left(100\%+30\%\right)=-1,3\)

\(x.130\%=-1,3\)

\(x=-1,3:130\%\)

\(x=-1\)

X.(1+30%)=-1.3

X.1.3=-1.3

X=-1

a)  x + 30 % x = − 1 , 3

x 1 + 3 10 = − 13 10 13 10 x = − 13 10 x = − 1

b)  1 3 x + 2 5 x − 1 = 0

1 3 x + 2 5 x − 2 5 = 0 11 15 x = 2 5 x = 2 5 : 11 15 x = 6 11

c)  3 x − 1 2 − 5 x + 3 5 = − x + 1 5

3 x − 3 2 − 5 x − 3 = − x + 1 5 x = − 3 2 − 3 − 1 5 x = − 47 10