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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
\(x+30\%\cdot x=-1,3\)
\(100\%\cdot x+30\%\cdot x=-1,3\)
\(x\cdot\left(100\%+30\%\right)=-1,3\)
\(x.130\%=-1,3\)
\(x=-1,3:130\%\)
\(x=-1\)
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
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-
\(x+30\%x=-1,3\)
\(\Leftrightarrow1x+\frac{30}{100}x=-1,3\)
\(\Leftrightarrow\frac{10}{10}x+\frac{3}{10}x=-1,3\)
\(\Leftrightarrow x\left(\frac{10}{10}+\frac{3}{10}\right)=-1,3\)
\(\Leftrightarrow\frac{13}{10}x=\frac{-13}{10}\)
\(\Leftrightarrow x=\frac{-13}{10}\div\frac{13}{10}\)
\(\Leftrightarrow x=\frac{-13}{10}\times\frac{10}{13}\)
\(\Leftrightarrow x=-1\)