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2014-07-11T08:29:38-03:00
(5)(A)2a+b=2.( -\frac{1}2} )+  \frac{2}{5} =- \frac{2}{2}(1) + \frac{2}{5} = -\frac{5}{5} + \frac{2}{5} = -\frac{3}{5}

(B) x^{2} +2x= 5^{2} +2(-5)=25-10=15

(C)= \frac{3xy}{-2 +\sqrt{y} }= \frac{3.-2.16}{-2+ \sqrt{16} } = \frac{96}{2  } =48

(6)(A)35+7,5.X

(B)35+7,5.6=35+45=80

(7)x+y+3x+y+100=4x+2y+100  Alternativa (D)

(8)10x

(9)3500+420n  1 Tonelada=1000 Kg

(10) \frac{p}{4}


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