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2014-07-13T13:43:58-03:00
Olá Rafaela!

Para resolver as inequções do 1 grau é só igualar cada uma delas a 0 e determinar o intervalo...

x-3>0 \\ x>3 \\  \\ 2-x>0 \\ -x>-2*(-1) \\ x<2
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Letra A....S=]2,3[

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3x-6>0 \\ 3x>6 \\ x>6/3 \\ x>2 \\  \\ 2-4x>0 \\ -4x>-2*(-1) \\ 4x<2 \\ x< \frac{1}{2}

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Letra B..S=] \frac{1}{2},2 [

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-x+2<0 \\ -x<-2*(-1) \\ x>2 \\  \\ -3x-9<0 \\ -3x<9 \\ -x<9/3 \\ -x<3*(-1) \\ x>-3

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Letra C...S=]-3,2[

2 5 2