Respostas

  • Usuário do Brainly
2013-05-28T16:53:16-03:00

Seja \text{x}=\dfrac{1}{2}-\dfrac{1}{4}-1+0,3-(-0,9+0,8)

 

Desta maneira, temos que:

 

\text{x}=\dfrac{1}{2}-\dfrac{1}{4}-1+\dfrac{3}{10}+\dfrac{1}{10}

 

Logo:

 

\text{x}=\dfrac{10-5-20+6+2}{20}=\dfrac{-7}{20}

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