Question

Tìm x:

x + 30% x = -1,31

Answer 1

Ta có: x(1+30%)=-1,31

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

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

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

Answer 2

x + 30% x = -1,31

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

x+0,3x=-1,31

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

x.1,3=-1,31

\(x=\dfrac{-1,31}{1,3}\)

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