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Sejam as funções f : IN → IR e g : IN → IR definidas por f(x)= x/2 e g(x) = 2-x
Considere os números A e B , tais que
A = f(1)+f(2)+... + f(50) e
B = 1 + g(1)+g(2)+... + g(n)+...
Se o produto de A por B tende para o número α, então, α. é
Sejam z = x + yi (x ∈ IR*, y ∈ IR* e i a unidade imaginária), 
o
conjugado de z e λ o lugar geométrico dos pontos
P(x, y) do plano cartesiano para os quais z.
= 2x + 3
Se A e B são os pontos de interseção de λ com o eixo 
e se
A' é o ponto de interseção de λ com o eixo 
que possui a
menor abscissa, então a área do triângulo A'AB é, em unidades
de área, igual a
Uma pequena fábrica de cintos paga a seus funcionários o salário, conforme tabela abaixo
Certo mês, houve um aumento de 10% sobre os salários da tabela acima para todos os cargos.
Sabendo-se que a nova média salarial passou a ser de 1650
reais, o novo salário do gerente é, em reais, igual a
No time to relax
Even when we relax we do everything more quickly. Ten years ago when people went to art galeries they spend ten seconds looking at each picture. Today they spend just three seconds!
Oxford, New English File
According to the paragraph
Rosana Fisher works at an outdoor activities centre on the west coast of Scotland. She teaches mountain climbing, scuba diving and hang-gliding. She's talking to some young people who've just arrived at the centre:
I - 'You can't do any of the activities unless you're with an instructor.'
II - 'We won't let you start an activity if you don't have the correct equipment.'
III - 'You can't go scuba diving unless you've done the training course.'
IV - 'Remember you can't leave the centre unless you say where you're going.'
English Grammar in Steps - Richmond
Rosana Fisher works at an outdoor activities centre on the west coast of Scotland. She teaches mountain climbing, scuba diving and hang-gliding. She's talking to some young people who've just arrived at the centre:
I - 'You can't do any of the activities unless you're with an instructor.'
II - 'We won't let you start an activity if you don't have the correct equipment.'
III - 'You can't go scuba diving unless you've done the training course.'
IV - 'Remember you can't leave the centre unless you say where you're going.'
English Grammar in Steps - Richmond
Mark the option which shows another way to rewrite the conditional sentences above, correctly.
I - You can do none of the activities if you don't be with an instructor.
II - We will not let you start an activity unless you have the correct equipment.
III - You cannot going scuba diving if you haven't done the training course.
IV - Remember you can't leave the centre if you don't say where
you go.
Mark the option which contains the correct Question Tag of the following sentence.
"She has not yet demonstrated a link between increased brainwaves and suicidal tendencies..."
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