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(- 5/4 + 2/7·(14/5))/((- 3^2/10 - 2 - 1/2 - (11/5 - 7/4 - 1)) + 3/20)+

- (1/3 - 3/2 + 1)^2 + (- 1/6)^2=

=(- 5/4 + 4/5)/((- 9/10 - 2 - 1/2 - - 11/20) + 3/20) - (- 1/6)^2 + (- 1/6)^2=

=(- 9/20)/((- 9/10 - 2 - 1/2 + 11/20) + 3/20)=

=(- 9/20)/(- 57/20 + 3/20)=

=(- 9/20)/(- 27/10) = 1/6

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$\small \left(-\dfrac{5}{4}+\dfrac{2}{\cancel7_1}·\dfrac{\cancel{14}^2}{5}\right)÷\left\{\left[-\dfrac{3^2}{10}-2-\dfrac{1}{2}-\left(\dfrac{11}{5}-\dfrac{7}{4}-1\right)\right]+\dfrac{3}{20}\right\}-\left(\dfrac{1}{3}-\dfrac{3}{2}+1\right)^2+\left(-\dfrac{1}{6}\right)^2=$

$\small = \left(-\dfrac{5}{4}+2·\dfrac{2}{5}\right)÷\left\{\left[-\dfrac{9}{10}-2-\dfrac{1}{2}-\left(\dfrac{44-35-20}{20}\right)\right]+\dfrac{3}{20}\right\}-\left(\dfrac{2-9+6}{6}\right)^2+\dfrac{1}{36}=$

$\small = \left(-\dfrac{5}{4}+\dfrac{4}{5}\right)÷\left\{\left[\dfrac{-9-20-5}{10}-\left(-\dfrac{11}{20}\right)\right]+\dfrac{3}{20}\right\}-\left(-\dfrac{1}{6}\right)^2+\dfrac{1}{36}=$

$\small = \left(\dfrac{-25+16}{20}\right)÷\left\{\left[-\dfrac{34}{10}+\dfrac{11}{20}\right]+\dfrac{3}{20}\right\}\cancel{-\dfrac{1}{36}}\cancel{+\dfrac{1}{36}}=$

$\small = \left(-\dfrac{9}{20}\right)÷\left\{\left[\dfrac{-68+11}{20}\right]+\dfrac{3}{20}\right\}=$

$\small = \left(-\dfrac{9}{20}\right)÷\left\{-\dfrac{57}{20}+\dfrac{3}{20}\right\}=$

$\small = \left(-\dfrac{9}{20}\right)÷\left\{-\dfrac{54}{20}\right\}=$

$\small = \left(-\dfrac{\cancel9^1}{\cancel{20}_1}\right)·\left\{-\dfrac{\cancel{20}^1}{\cancel{54}_6}\right\}=$

$\small = \left(-1\right)·\left\{-\dfrac{1}{6}\right\}=$

$\small = \dfrac{1}{6}$

(- 5/4 + 2/7 * (14/5)) / ((- 3^2/10 - 2 - 1/2 - (11/5 - 7/4 - 1)) + 3/20)- (1/3 - 3/2 + 1)^2 + (-1/6)^2

(- 5/4 + 4/5) / ((- 9/10 - 2 - 1/2 - 11/20) + 3/20) - (- 1/6)^2 + (- 1/6)^2

(- 9/20) / ((- 9/10 - 2 - 1/2 + 11/20) + 3/20)

(- 9/20) / (- 57/20 + 3/20)

(- 9/20) / (- 27/10)

-9/20 * - 10/27

1 / (2*3)

1/6