Question

x + 30%x = -1,31 

tìm x

Answer 1

x+30%x=-1,31

<=> x(0.3+1)=-1,31

<=> X=\(\frac{-1,31}{1,3}\)

Answer 2

<=>x.(1+30%)=-1,31

<=>x.1,31=-1,31

<=>x=-1

Answer 3

\(x+30\%x=-1,31\)

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

\(\Leftrightarrow\dfrac{13}{10}x=-1,31\)

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