Respostas

  • Zhu
  • Ambicioso
2014-08-31T17:54:23-03:00
1000-10x+2x=3x+27-28
1000-8x=3x+1
1000-1=3x+8x
999=12x
x=999/12
x=83,25

   ou

x=333/4
2014-08-31T17:56:59-03:00
10(100-x)+2x=3(x+9)-28 

1.000 - 10X + 2X = 3X + 27 - 28 

- 10X + 2X - 3X = 27 - 28 - 1.000 

- 11X = - 1.001 (-1) 

11X = 1.001 

X = 1.001 : 11 

X = 91