Respostas

2014-05-15T23:42:06-03:00
A)1-5.1+1-1
   1-5+1-1 = -6+2 = -4

b)-1-5.(-1)+(-1)-1
   -1+5-1-1 
     -3+5 = 2

c)1-5.(-2)+(-2)-1
   1+10-2-1
      11-3  =  +8

d)1-5.3+3-1
   1-15+3-1
    -16+4  = -12

e)1-5.0+0-1
   1-0+0-1 =  0

f)1-5.1/2+1/2-1
  1-5/2+1/2-1
   1-4/2-1
   1-2-1 = -2


Espero ter ajudado, abraço.
2014-05-16T01:35:55-03:00
P(x)=x-5x+x-1
a) p(1) = 1 - 5*1 + 1 - 1 = 1 - 5 + 1 - 1 = -4
b)p(-1) = -1 - 5(-1) +(-1) - 1 = -1+5-1-1 = 2
c)p(-2) = -2 - 5(-2) +(-2) - 1 = -2 + 10 - 2 - 1 = 5
d)p(3) = 3 - 5*3 + 3 - 1 = 3 - 15 + 3 - 1 = 10
e)p(0) = 0 - 5*0 + 0 - 1 = -1
f}(1\2) = 
 \frac{1}{2}-5*\frac{1}{2}+ \frac{1}{2}-1= \frac{1}{2}-\frac{10}{2}+ \frac{1}{2}- \frac{2}{2}= \\  \frac{1-10+1-2}{2} = \frac{-10}{2}=-5