Foram encontradas 384 questões.
Seja T o operador linear cuja matriz na base natural {(1,0), (0,1)} é dada por !$ M = \begin{pmatrix} 3 & 1 \\ 2 & 2 \end{pmatrix} !$.
Assinale V (verdadeiro) ou F (falso):
Item 4: O operador T possui um operador inverso T-1 tal que para todo ponto (x,y) !$ ∈ !$ R2 tem-se T-1 (T(x,y)) = (x,y).
Provas
Questão presente nas seguintes provas
Dada a equação de diferenças finitas do segundo grau !$ 2y_{t+2} + 2y_{t+1} + y_t = 10 !$ com valores !$ y_0 = 3 !$ e !$ y_1 = 4 !$, assinale V (verdadeiro) ou F (falso):
Item 3: valor da solução geral no infinito é !$ lim_{t \rightarrow \infty} !$ !$ y_t !$ !$ = 2 !$;
Provas
Questão presente nas seguintes provas
Nos anos posteriores ao final da Segunda Guerra, o Brasil passou de uma situação relativamente confortável no setor externo para uma crise aguda que obrigou a adoção de controles quantitativos. Entre os motivos dessa deterioração das contas externas podemos assinalar:
Item 4: o aumento do pagamento de juros associado ao crescimento do endividamento externo no período da Segunda Guerra.
Provas
Questão presente nas seguintes provas
FIRST TEXT
Sympathetic writers talk of Marx’s passionate empathy toward the working class, his demands for a decent wage and improved working conditions, and his great feeling for his family’s welfare. In this respect, Marx is an enigma. In the classroom’s most popular book on the history of economics, Robert L. Heilbroner writes that, despite his reputation as a contentious and vengeful man who feuded constantly with his contemporaries, Marx was a devoted husband and father. In a sympathetic biography, Saul K. Padover notes, “Marx, the harsh critic and angry radical in his public life and writings, was a different man in private. In his personal life, he was extraordinarily kind and generous and, when not tormented by illnesses, gay. . . . [As a] self-assured male, Marx has a genuine affection and esteem for women. . . . [And] Jenny was the only woman in his life.”
Apologists for Marx are almost always blind to the darker side of the creator of communism. They write of his devotion to his family and his love letters to his wife but ignore or condone his illicit affair with the family’s household servant, Lenchen, which produced an illegitimate son whom Marx would have nothing to do with. Interestingly, Marx also never paid this servant a penny for her housework.
Karl and Jenny Marx were poverty-stricken but not for want of money. They received large sums over the years from Engels, other supporters, and from Marx’s writings. One estimate is that Marx was poor only 15 years of his 65-year career, and that his income placed him in the top 5 percent of London residents in the 1860s. But the Marxes were financially incompetent and could not control their spending habits. Marx entertained lavishly, speculated on the stock market, and spent large sums on liquor, books, travel, and other consumer goods until he had to beg for more or borrow from pawnshops at usury rates. Such irresponsible spending habits often left his family starving, destitute, and in ill health. Marx’s family life was often a nightmare, resulting in the early death or eventual suicide of most of his children. Historian Robert Payne, in his biography of Marx, concludes, “He exploited everyone around him – his wife, his children, his mistress and his friends – with a ruthlessness which was all the more terrible because it was deliberate and calculating.” (“Was Marx a Good Family Man?” Skousen, Marx, Economics on Trial: Lies, Myths, and Realities. Business One Irwin, Homewood, Ill, 1991: 212-213).
According to the text:
Item 1: Despite the large sums that Marx received over the years he didn’t end up a well-to-do man.
Provas
Questão presente nas seguintes provas
SECOND TEXT
All things considered, it must have been a crummy week to be the king of the software world. If you are Bill Gates, you’re used to being cursed by competitors, hounded by regulators and lampooned by late-night comics as the perfect – albeit perfect rich – geek. But no one, not even Gates, could be comfortable with the idea that one’s masterpiece – which happens to the biggest and most powerful software company on earth – could be taken and sliced in two.
But that’s precisely what state and federal trustbusters demanded last week. In a filing submitted to federal Judge Thomas Penfield Jackson, the Justice Department and 17 of 19 states that have brought suits against Microsoft finally agreed: Microsoft should be chopped into two companies. One would develop and sell the Windows operating system that runs 85% of the world’s desktop computers. The other business would handle everything else – most notably, the universally used “applications” software, such as Microsoft Office, which includes its dominant word processing and spreadsheet programs, and its Web-browsing Internet Explorer.
The two companies could not collude or cooperate in any way for 10 years. During that time, they would be required to strive ceaselessly against each other. Gates would have to choose which company to run and hold stock in – while competing with the other.
To antitrust chief Joel Klein, the plan strikes a perfect balance: “Neither the heavy hand of ongoing government regulation nor the self-interest of an entrenched monopolist will decide what is in the best interest of consumers,” he says. “Rather, consumers will be able to choose for themselves the products they want in a free and competitive marketplace.” Counters Gates: “We don’t believe the courts are going to uphold this kind of unprecedented and radical regulation of our activities.”
But beyond the angry words and legal documents, the proposed remedy marked the culmination of 23 months of state and federal pursuit of Microsoft and represents a clear watershed for the computer and software industries. The ruling that emerges from Judge Jackson’s court, and from an appeals process that could last two more years, will do much to determine the course of software development for decades to come – and with it the programs that countless companies and consumers use.
For now, Microsoft attorney William Neukom plans to push for an extension of the company’s May 10 deadline for responding to last Friday’s Justice Department proposal. Microsoft will want “months and months” of additional hearings in front of Jackson, who ruled on April 3 that the company had illegally and repeatedly used its monopoly power to stifle innovation. A final decision by Jackson might not come until the end of summer. Even then, any breakup that the judge might call for would be on hold until the appeals process is done. That’s why Klein and the states want Jackson’s ruling to include immediate restrictions on Microsoft’s conduct, including a measure that would bar it from retaliating against computer makers that load rivals’ software on their machines. In addition, prosecutors want Microsoft to publish a price list that would apply to all its largest customers. (“Carving up Gates,” Time magazine, May 8, 2000: 28-31).
According to the text, the two companies which will result from the division of Microsoft:
Item 1: would be required to compete against each other.
Provas
Questão presente nas seguintes provas
Uma loja vende um produto cujo preço, para pagamento à vista, é R$90. No caso de pagamento em duas parcelas, o preço torna-se R$100, divididos em R$50 no momento da compra mais outros R$50 após um mês. Calcule a taxa mensal R de juros implícita no financiamento em duas parcelas, e assinale V (verdadeiro) ou F (falso):
Item 1: Se o pagamento fosse em uma única parcela de valor X efetuada um mês após a compra, então para se manter a mesma taxa R de financiamento, esse pagamento único teria um valor X > R$110 ;
Provas
Questão presente nas seguintes provas
Entre os fatores que contribuíram para a apreciação do câmbio (valorização da moeda nacional) no período 1899-1905, devem ser mencionados:
Item 4: entradas significativas de capital estrangeiro.
Provas
Questão presente nas seguintes provas
Considere o jogo descrito pela seguinte matriz de possibilidades, em que (x, y) = (ganho do agente 1, ganho do agente 2)
| Agente 2 | |||
| Agente 1 | a | b | |
| A | 3,2 | 5,5 | |
| B | 0,0 | 7,4 | |
Item 1: O par de estratégias (B, b) é um equilíbrio de Nash.
Provas
Questão presente nas seguintes provas
Seja X uma variável aleatória, com função densidade de probabilidade f(x) contínua, definida sobre o espaço amostral A, do universo U:
Item 0: Tanto A como U devem ser contínuos.
Provas
Questão presente nas seguintes provas
Assinale V (verdadeiro) ou F (falso):
Item 2: para que um sistema homogêneo de equações lineares tenha infinitas soluções basta que o determinante da matriz dos coeficientes seja diferente de zero;
Provas
Questão presente nas seguintes provas
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