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  • Usuário do Brainly
2014-07-26T14:42:05-03:00
Soma=- \frac{b}{a}= \frac{5}{2}

Produto= \frac{c}{a} = \frac{-7}{2}

a)
 \frac{5}{2}-(- \frac{7}{2} )=6

 \frac{5}{2} + \frac{7}{2}=6

 \frac{12}{2} =6

6=6

b)

 \frac{5}{2} +(- \frac{7}{2})=2

 \frac{5}{2}- \frac{7}{2}  =2

- \frac{2}{2} =2

-1≠2

c)
 \frac{5}{2} .(- \frac{7}{2})=4

(- \frac{35}{2} )=4

-35/2≠4

d)
( \frac{5}{2} ):(- \frac{7}{2} )=1

 \frac{5}{2} .(- \frac{2}{7} )=1

-5/7≠1
e)
 \frac{5}{2} >- \frac{7}{2}     (falso)


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