Encontre a fração geratriz das seguintes dízimas periódicas:
a) 0,181818... d) 1,2777...
b) 0,555... e) 0,37888...
c) 3,1222... f) 2,5474747...
Soluções para a tarefa
Respondido por
2
Encontre a fração geratriz das seguintes dízimas periódicas:
a) 0,181818.
x = 0,181818....( 100)multiplica
100x = 18,181818..
100x = 18,181818...
x = 0,181818... subtrai
---------------------------------------
99x = 18,000000...
99x = 18
x = 18/99 ( divide AMBOS por 3)
ou
x = 6/33
ASSIM
0,181818... = 18/99
ou
0,181818... = 6/33
.. d) 1,2777...
x = 1,2777...(10)multiplica
10x = 12,777...(10)multiplica
100x =127,777...
100x = 127,777...
10x = 12,777... subtrai
-----------------------------------
90x = 115,0000...
90x = 115
x = 115/90
assim
1,2777... =115/90
b) 0,555...
x = 0,555... ( 10)multiplica
10x = 5,555...
10x = 5,555...
x = 0,555... subtrai
--------------------------------
9x = 5,000...
9x = 5
x = 5/9
assim
0,555... = 5/9
e) 0,37888...
x = 0,37888... ( 100) multiplica
100x = 37,88888... (10) multiplica
1000x = 378,8888...
1000x = 378,888...
100x = 37,888... subtrai
------------------------------------
900x = 341,000...
900x = 341
x = 341/900
ASSIM
0,37888... = 341/900
c) 3,1222...
x = 3,1222... ( 10) multiplica
10x = 31,222.. ( 10) multiplica
100x = 312,222..
100x = 312,222...
10x = 31,222... subtrai
--------------------------------
90x = 281,000...
90x = 281
x = 281/90
assim
3,1222... = 281/90
f) 2,5474747..
x = 2,5474747... (10) multiplica
10x = 25,474747...(100)multiplica
1000x = 2547,474747...
1000x = 2547,474747....
10x = 25,474747...subtrai
-------------------------------------------
990x = 2522,000000....
990x = 2522
x = 2522/990
assim
2,5474747... = 2522/990
.
a) 0,181818.
x = 0,181818....( 100)multiplica
100x = 18,181818..
100x = 18,181818...
x = 0,181818... subtrai
---------------------------------------
99x = 18,000000...
99x = 18
x = 18/99 ( divide AMBOS por 3)
ou
x = 6/33
ASSIM
0,181818... = 18/99
ou
0,181818... = 6/33
.. d) 1,2777...
x = 1,2777...(10)multiplica
10x = 12,777...(10)multiplica
100x =127,777...
100x = 127,777...
10x = 12,777... subtrai
-----------------------------------
90x = 115,0000...
90x = 115
x = 115/90
assim
1,2777... =115/90
b) 0,555...
x = 0,555... ( 10)multiplica
10x = 5,555...
10x = 5,555...
x = 0,555... subtrai
--------------------------------
9x = 5,000...
9x = 5
x = 5/9
assim
0,555... = 5/9
e) 0,37888...
x = 0,37888... ( 100) multiplica
100x = 37,88888... (10) multiplica
1000x = 378,8888...
1000x = 378,888...
100x = 37,888... subtrai
------------------------------------
900x = 341,000...
900x = 341
x = 341/900
ASSIM
0,37888... = 341/900
c) 3,1222...
x = 3,1222... ( 10) multiplica
10x = 31,222.. ( 10) multiplica
100x = 312,222..
100x = 312,222...
10x = 31,222... subtrai
--------------------------------
90x = 281,000...
90x = 281
x = 281/90
assim
3,1222... = 281/90
f) 2,5474747..
x = 2,5474747... (10) multiplica
10x = 25,474747...(100)multiplica
1000x = 2547,474747...
1000x = 2547,474747....
10x = 25,474747...subtrai
-------------------------------------------
990x = 2522,000000....
990x = 2522
x = 2522/990
assim
2,5474747... = 2522/990
.
Perguntas interessantes
Matemática,
10 meses atrás
Geografia,
10 meses atrás
Matemática,
10 meses atrás
Administração,
1 ano atrás
Matemática,
1 ano atrás
Química,
1 ano atrás