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Speravo di trovarlo questo 191! Sono curiosa! Ciao @marialuigia

Vedi di mettere il testo.

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$\small x÷\left[\left(3+\dfrac{1}{2}\right)÷\left(1-\dfrac{1}{3}\right)\right]=\left[2·\left(\dfrac{2}{5}\right)^2·\left(2+\dfrac{7}{4}\right)-\dfrac{2}{3}\right]÷\left\{\left[\dfrac{2}{5}+\left(5-\dfrac{2}{5}-\dfrac{21}{5}\right)^2\right]÷2\right\}$

$\small x÷\left[\left(\dfrac{6+1}{2}\right)÷\left(\dfrac{3-1}{3}\right)\right]=\left[2·\dfrac{4}{25}·\left(\dfrac{8+7}{4}\right)-\dfrac{2}{3}\right]÷\left\{\left[\dfrac{2}{5}+\left(\dfrac{25-2-21}{5}\right)^2\right]·\dfrac{1}{2}\right\}$

$\small x÷\left[\dfrac{7}{2}÷\dfrac{2}{3}\right]=\left[\dfrac{\cancel8^2}{\cancel{25}_5}·\dfrac{\cancel{15}^3}{\cancel4_1}-\dfrac{2}{3}\right]÷\left\{\left[\dfrac{2}{5}+\left(\dfrac{2}{5}\right)^2\right]·\dfrac{1}{2}\right\}$

$\small x÷\left[\dfrac{7}{2}·\dfrac{3}{2}\right]=\left[\dfrac{2}{5}·3-\dfrac{2}{3}\right]÷\left\{\left[\dfrac{2}{5}+\dfrac{4}{25}\right]·\dfrac{1}{2}\right\}$

$\small x÷\dfrac{21}{4}=\left[\dfrac{6}{5}-\dfrac{2}{3}\right]÷\left\{\left[\dfrac{10+4}{25}\right]·\dfrac{1}{2}\right\}$

$\small x÷\dfrac{21}{4}=\left[\dfrac{18-10}{15}\right]÷\left\{\dfrac{\cancel{14}^7}{25}·\dfrac{1}{\cancel2_1}\right\}$

$\small x÷\dfrac{21}{4}=\dfrac{8}{15}÷\dfrac{7}{25}$

$\small x=\dfrac{\cancel{21}^7}{\cancel4_1}·\dfrac{\cancel8^2}{\cancel{15}_5}÷\dfrac{7}{25}$

$\small x=\cancel7^1·\dfrac{2}{\cancel5_1}·\dfrac{\cancel{25}^5}{\cancel7_1}$

$\small x= 2·5$

$\small x= 10$