Question

obtenha as geratrizesdas seguintes dizimas periodicas. use o dispositivo pratico

a) -2,0313131...

b)5,121212...

Answer 1

A/ x=-2,0313131... (I)
10.x=-2,0313131... (II)
10x=-20,313131... (III)

10x=-20,313131... (III)
- x= -2,0313131... (I)
______________
9x= -18,000000...

x= -18/9


B/ x=5,121212... (I)
10.x=5,121212... (II)
10x=51,21212... (III)

10x=51,21212... (III)
- x= 5,121212... (I)
____________
9x=46,00000...

x= 46/9