9000065308
Level:
B
For the arithmetic sequence with the first term $a_1=3$ holds $a_n=27$ and the sum of the first $n$ terms is $195$. Find $n$.
\(n = 13\)
\(n = 14\)
\(n = 15\)
\(n = 16\)
B
9000065504
Level:
B
Evaluate the following integral on the interval \((0;+\infty)\).
\[
\int (1 -\sqrt{x})(1 + \sqrt{x})\, \mathrm{d}x
\]
\(x -\frac{1}
{2}x^{2} + c,\ c\in \mathbb{R}\)
\((x -\frac{1}
{2}x^{2})(x + \frac{1}
{2}x^{2}) + c,\ c\in \mathbb{R}\)
\(x -\frac{1}
{2}x^{\frac{1}
{2} } + c,\ c\in \mathbb{R}\)
\((x -\frac{1}
{2}x^{-\frac{1}
{2} })(x + \frac{1} {2}x^{-\frac{1}
{2} }) + c,\ c\in \mathbb{R}\)
9000065506
Level:
B
Evaluate the following integral on the interval \((0;+\infty)\).
\[
\int \frac{x^{2}}
{\sqrt{x}}\, \mathrm{d}x
\]
\(\frac{2}
{5}x^{2}\sqrt{x} + c,\ c\in \mathbb{R}\)
\(\frac{2\sqrt{x}}
{x} + c,\ c\in \mathbb{R}\)
\(\frac{2}
{5}x\sqrt{x} + c,\ c\in \mathbb{R}\)
\(\frac{\sqrt{x}}
{x} + c,\ c\in \mathbb{R}\)
9000065310
Level:
B
For the arithmetic sequence with \(a_{4} = 11\)
and \(a_{9} = -24\)
find the sum of the first fourteen terms.
\(- 189\)
\(189\)
\(198\)
\(- 198\)
9000064806
Level:
B
The arithmetic sequence is defined by the first term
\(a_{1} = 17\) and the
fifth term \(a_{5} = 11\).
Find the term which is seven times smaller than the third term of the sequence.
\(a_{11}\)
\(a_{2}\)
\(a_{8}\)
\(a_{17}\)
\(a_{21}\)
9000065505
Level:
B
Evaluate the following integral on \(\mathbb{R}\).
\[
\int (x^{2} + 3)(x^{2} - 1)\, \mathrm{d}x
\]
\(\frac{1}
{5}x^{5} + \frac{2}
{3}x^{3} - 3x + c,\ c\in \mathbb{R}\)
\((\frac{1}
{3}x^{3} + 3x)(\frac{1}
{3}x^{3} - x) + c,\ c\in \mathbb{R}\)
\(4x^{2} + c,\ c\in \mathbb{R}\)
\(4x^{3} + 4x + c,\ c\in \mathbb{R}\)
9000064501
Level:
B
Find the quadratic equation with the solution
\(x_{1, 2} =\pm 2\mathrm{i}\).
\(x^{2} + 4 = 0\)
\(x^{2} - 4\mathrm{i} = 0\)
\(x^{2} - 4 = 0\)
\(x^{2} + 4\mathrm{i} = 0\)
9000064502
Level:
B
Find the quadratic equation with the solution
\(x_{1, 2} = 2\pm \mathrm{i}\sqrt{2}\).
\(x^{2} - 4x + 6 = 0\)
\(3x^{2} + 4x + 2 = 0\)
\(3x^{2} - 4x + 2 = 0\)
\(x^{2} + 4x + 6 = 0\)
9000064503
Level:
B
Find the values of the real coefficients
\(a\),
\(b\) and
\(c\) such
that the quadratic equation
\[
ax^{2} + bx + c = 0
\]
has solution \(x_{1, 2} =\pm \mathrm{i}\frac{\sqrt{5}}
{3} \).
\(a = 9\text{, }b = 0\text{, }c = 5\)
\(a = 5\text{, }b = 0\text{, }c = 9\)
\(a = 9\text{, }b = 0\text{, }c = -5\)
\(a = 5\text{, }b = 0\text{, }c = -9\)
9000064504
Level:
B
Find the values of the real coefficients
\(a\),
\(b\) and
\(c\) such
that the quadratic equation
\[
ax^{2} + bx + c = 0
\]
has solutions \(x_{1, 2} = 1\pm \frac{\mathrm{i}}
{2}\).
\(a = 4\text{, }b = -8\text{, }c = 5\)
\(a = 1\text{, }b = -4\text{, }c = 5\)
\(a = 4\text{, }b = 8\text{, }c = 5\)
\(a = 1\text{, }b = 4\text{, }c = 5\)