Question

aqui na apostila diz :

 

A=1/3+{-1/5}               b= {-2/5}-{-1/3}     e   C= {-4/5}+2/7

 

ai ele pede o valor de 

 a) A

 

 

b) B

 

 

c) C

 

 

d) a+b+c

 

 

 

e)a-b-c

Answer 1

 

A=1/3+{-1/5}               b= {-2/5}-{-1/3}     e   C= {-4/5}+2/7

 

 a) A = 1/3 - 1/5 = 1/15(5 - 3) = 1/15(2) = 2/15 

 

 

b) B = {-2/5}-{-1/3} = - 2/5 + 1/3 = 1/15(- 6 + 5) = 1/15(- 1) = - 1/15

 

 

c) C = -4/5 + 2/7 = 1/35(- 28 + 10) = 1/35(- 18) = - 18/35

 

 

d) a + b +c = 2/15 - 1/15 - 18/35 = 1/15 - 18/35 = 1/105(7 - 54) = 1/105(47) = 47/105

 

 

e) a - b - c = 2/15 - (-1/15) - (-18/35) = 3/15 + 18/35 = 1/105(21 + 54) = 75/105 = 5/7