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1000 EXERCÍCIOS RESOLVIDOS E COMENTADOS DE MATEMÁTICA

MAIS DE 1000 EXERCÍCIOS DE MATEMÁTICA RESOLVIDOS E COMENTADOS .

Os exercícios são de concursos específicos para o ensino médio e superior, havendo muito mais do que 1000 exercícios resolvidos e comentados, em virtude das atualizações .

Videoaula de matemática grátis.


exercicios matematica

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Veja um dos exercícios resolvidos e comentados.

Dois relógios são acertados às 12 horas.Um relógio adianta exatamente 60 segundos por dia e outro atrasa exatamente 90 segundos. Após 30 dias, a diferença entre os horários marcados pelos dois relógios será de:

 

(A) 1h10min.

(B) 1h15min.

(C) 1h20min.

(D) 1h25min.

(E) 1h30min.

 

 Solução

 

O relógio A adianta 60 segundos por dia, em 30 dias adiantará 1800 segundos, ou seja 30 minutos ( 1800/60)

 

O relógio B atrasa 90 segundos/dia. Em 30 dias 2700 segundos ou 45 minutos atrasado.

 

Se é 1 hora, o relógio A que adianta 30 minutos, marcará 1:30.

 

Já o relógio B que atrasa 45 minutos, marcará 12:15, portanto a diferença entre ambos (que também bastaria somar 45 30=1:15) é de: 1(uma) hora e 15(quinze) minutos

 

Resposta: B

 

 
Exercícios do ensino médio e superior

MMC - Calcular o tempo necessário, para uma torneira encher um reservatório com duas torneiras ligadas simultaneamente.

Regra de três simples e composta - Para o cálculo do salário, se esse salário diminuído de x% corresponde a y salário.

Juros Simples e Compostos - Para o cálculo do resgate de uma aplicação após 30 dias -Ao comprar um eletrodoméstico sem entrada com uma única prestação de 30 dias para pagar, o sicrano aplicou um valor X por 30 dias, a uma taxa de juros simples de 36% ao ano, e passado os 30 dias após a aplicação, o sicrano resgatou o suficiente para pagar a prestação, sobrando Y.

Sistema Métrico - Para medir a área livre do terreno, se esse terreno medindo Xm² e área construída de 2/7 da área do terreno, for acrescida de Ym².

Progressão geométrica - A soma dos 9 primeiros termos da seqüência (1, 2, 4, 8, ...), na qual x é um número real maior que 1:

e outros exercícios de : Equações e inequações do 1º e 2º graus - Simetria - Trigonometria - Geometria plana e espacial - Geometria analítica - matrizes - Raciocínio Lógico e matemático - Função logarítmica e etc.

500 exercícios resolvidos e comentados, de concursos, por assunto:
Operações nos Conjuntos Numéricos
Sistemas de numeração
MMC
MDC
Expressões
Conversão de Unidades
Regras de Três
Porcentagem
Problemas de Compra e Venda
Razão e Proporção
Divisão Proporcional
Escalas
Seqüências Numéricas
Progressões
Médias
Função do 1º grau
Sistemas de Equações
Equação do 2º grau
Função do 2º grau
Equações Algébricas
Inequações
Logaritmos
Equações Logarítmicas
Função Logarítmica
Equações Exponenciais
Função Exponencial 293
Juros Simples
Desconto Simples
Juros Compostos
Taxas
Rendas Financeiras
Sistemas de Amortização
Mercado Financeiro (papéis)
Polinômios
Análise Combinatória
Probabilidade
Geometria Espacial
Geometria Plana
Geometria Analítica
Trigonometria
Estatística Descritiva
Raciocínio Lógico Matemático


                                                                      
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