DESAFIO DE MATEMÁTICA 2012
Autor: Max Pádua | Publicado: 2012-05-03T17:30:00-07:00

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LISTA DE EXERCÍCIOS 1

1) (&nbsp;10&nbsp;pontos ) Quantos números inteiros têm valor absoluto menor que 5?

a) 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 9



2) ( 20&nbsp;pontos ) Calculando corretamente as expressões abaixo, em quantas delas encontramos&nbsp; o resulatado ímpar:

( + 14 ) + ( - 5 ) + ( + 7 ) - ( - 11 ) = 

5 - 11.( - 6 + 4 ) + 3.( 7 - 13 ) =

28 : ( - 4 ) + 9 . ( - 1 ) - 3.( 5 - 16 ) =

a) Em nenhuma&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) Em&nbsp;uma&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) Em&nbsp;duas&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d) Em três



3) (&nbsp;10 pontos ) Numa viagem de 90 km, já foram percorridos 3/4. Quantos quilômetros já foram percorridos?



4) ( 10 pontos ) Durante uma experiência, a temperatura foi medida e estava marcando - 3° C. O professor pediu para baixar 5° C essa temperatura. Se isso acontecer, o termômetro marcará:_______



5) ( 30 pontos ) Numa pesquisa realizada entre esportistas revelou-se que 50 pessoas praticam futebol, 30 pessoas praticam voleibol e 10 pessoas praticam futebol e voleibol. Quantas pessoas foram pesquisadas?



6) ( 20 pontos ) O sucessor do número 1008999 é:

a) 1010000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 1009000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 1008000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 1008998



7) ( 20 pontos )&nbsp;No sistema de numeração decimal, utilizam-se:

a) 9 números&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 9 algarismos&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 10 números&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 10 algarismos



8) ( 20 pontos ) O número "dois milhões e quinze mil" é representado por:

a) 2000015&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 2015000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 2105000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 2150000



9) ( 30 pontos ) A soma dos dez primeiros números naturais ímpares é:

a) 10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 100&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 200


10) ( 50 pontos ) Quatro times disputaram um torneio de futebol em que cada um jogou uma vez contra cada um dos outros. Quando uma partida terminava empatada, cada time ganhava um ponto; caso contrário, o vencedor ganhava três pontos e o perdedor, zero. A tabela mostra a pontuação final do torneio. Quantos foram os empates?




Time

Pontos




Cruz das Caldas

5


Flamengus

3


Varzea do Oeste

3


Santa Cruz

2





a) 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c) 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e) 6