1. A
   $\left(-\frac{11}{7},\frac{13}{7},\frac{19}{7}\right)$ and $\left(\frac{1}{7},\frac{3}{7},\frac{5}{7}\right)$ — check options
2. B
   $\left(\frac{19}{7},-\frac{11}{7},\frac{13}{7}\right)$ and $\left(-\frac{1}{7},\frac{3}{7},-\frac{5}{7}\right)$
3. C
   $\left(\frac{13}{7},11,19\right)$ and $\left(-\frac{1}{7},-\frac{3}{7},\frac{5}{7}\right)$
4. D
   $\left(\frac{13}{7},-\frac{11}{7},\frac{19}{7}\right)$ and $\left(\frac{1}{7},-\frac{3}{7},-\frac{5}{7}\right)$

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1. A
   $2x+2y+z-1=0$
2. B
   $2x-y-2z+5=0$
3. C
   $2x+2y-2z+1=0$
4. D
   $x-2y+z-1=0$

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1. A
   $0°$
2. B
   $30°$
3. C
   $60°$
4. D
   $90°$

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1. A
   $x^2+y^2+z^2-2x-8z=0$
2. B
   $x^2+y^2+z^2-2x-6y=0$
3. C
   $x^2+y^2+z^2-6y-8z=0$
4. D
   $x^2+y^2+z^2-2x-6y-8z=0$

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1. A
   -15
2. B
   -13
3. C
   -11
4. D
   -9

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1. A
   10
2. B
   20
3. C
   50
4. D
   100

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1. A
   0
2. B
   12
3. C
   112
4. D
   1012

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1. A
   16
2. B
   6
3. C
   5
4. D
   4

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1. A
   $\frac{17}{108}$
2. B
   $\frac{5}{108}$
3. C
   $\frac{19}{108}$
4. D
   $\frac{23}{108}$

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1. A
   12
2. B
   15
3. C
   20
4. D
   30

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1. A
   $\frac{1}{81}$
2. B
   $\frac{1}{72}$
3. C
   $\frac{1}{18}$
4. D
   $\frac{1}{36}$

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1. A
   $\frac{7}{36}$
2. B
   $\frac{7}{18}$
3. C
   $\frac{5}{18}$
4. D
   $\frac{11}{36}$

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1. A
   $1.1\times2^8$
2. B
   $1.2\times7^4$
3. C
   5.5
4. D
   0.55

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1. A
   0.00512
2. B
   0.02048
3. C
   0.2048
4. D
   0.0512

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1. A
   0.10
2. B
   0.19
3. C
   0.45
4. D
   0.95

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1. A
   -r
2. B
   r
3. C
   3r
4. D
   -3r

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1. A
   $\frac{7}{16}$
2. B
   $\frac{1}{16}$
3. C
   $\frac{1}{32}$
4. D
   $\frac{1}{64}$

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1. A
   1
2. B
   $\frac{14}{17}$
3. C
   $\frac{17}{14}$
4. D
   131

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1. A
   $\frac{1}{n}$
2. B
   $\frac{2}{n}$
3. C
   $\frac{4}{n}$
4. D
   $\frac{1}{2n}$

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1. A
   $\frac{1}{4}$
2. B
   $\frac{1}{2}$
3. C
   $\frac{3}{4}$
4. D
   $\frac{4}{5}$

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