-{31/2-[-(71/5-4)+(20/5-2)]-5} eching

$$- \{ 3 \frac { 1 } { 2 } - [ - ( 7 \frac { 1 } { 5 } - 4 ) + ( \frac { 20 } { 5 } - 2 ) ] - 5 \}$$

Baholash

$$\frac{3}{10}=0,3$$

Yechim qadamlari

6 hosil qilish uchun 3 va 2 ni ko'paytirish.

$$-\left(\frac{6+1}{2}-\left(-\left(\frac{7\times 5+1}{5}-4\right)+\frac{20}{5}-2\right)-5\right)$$

7 olish uchun 6 va 1'ni qo'shing.

$$-\left(\frac{7}{2}-\left(-\left(\frac{7\times 5+1}{5}-4\right)+\frac{20}{5}-2\right)-5\right)$$

35 hosil qilish uchun 7 va 5 ni ko'paytirish.

$$-\left(\frac{7}{2}-\left(-\left(\frac{35+1}{5}-4\right)+\frac{20}{5}-2\right)-5\right)$$

36 olish uchun 35 va 1'ni qo'shing.

$$-\left(\frac{7}{2}-\left(-\left(\frac{36}{5}-4\right)+\frac{20}{5}-2\right)-5\right)$$

4 ni \frac{20}{5} kasrga o‘giring.

$$-\left(\frac{7}{2}-\left(-\left(\frac{36}{5}-\frac{20}{5}\right)+\frac{20}{5}-2\right)-5\right)$$

\frac{36}{5} va \frac{20}{5} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$-\left(\frac{7}{2}-\left(-\frac{36-20}{5}+\frac{20}{5}-2\right)-5\right)$$

16 olish uchun 36 dan 20 ni ayirish.

$$-\left(\frac{7}{2}-\left(-\frac{16}{5}+\frac{20}{5}-2\right)-5\right)$$

-\frac{16}{5} va \frac{20}{5} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$-\left(\frac{7}{2}-\left(\frac{-16+20}{5}-2\right)-5\right)$$

4 olish uchun -16 va 20'ni qo'shing.

$$-\left(\frac{7}{2}-\left(\frac{4}{5}-2\right)-5\right)$$

2 ni \frac{10}{5} kasrga o‘giring.

$$-\left(\frac{7}{2}-\left(\frac{4}{5}-\frac{10}{5}\right)-5\right)$$

\frac{4}{5} va \frac{10}{5} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$-\left(\frac{7}{2}-\frac{4-10}{5}-5\right)$$

-6 olish uchun 4 dan 10 ni ayirish.

$$-\left(\frac{7}{2}-\left(-\frac{6}{5}\right)-5\right)$$

-\frac{6}{5} ning teskarisi \frac{6}{5} ga teng.

$$-\left(\frac{7}{2}+\frac{6}{5}-5\right)$$

2 va 5 ning eng kichik umumiy karralisi 10 ga teng. \frac{7}{2} va \frac{6}{5} ni 10 maxraj bilan kasrlarga aylantirib oling.

$$-\left(\frac{35}{10}+\frac{12}{10}-5\right)$$

\frac{35}{10} va \frac{12}{10} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$-\left(\frac{35+12}{10}-5\right)$$

47 olish uchun 35 va 12'ni qo'shing.

$$-\left(\frac{47}{10}-5\right)$$

5 ni \frac{50}{10} kasrga o‘giring.

$$-\left(\frac{47}{10}-\frac{50}{10}\right)$$

\frac{47}{10} va \frac{50}{10} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$-\frac{47-50}{10}$$

-3 olish uchun 47 dan 50 ni ayirish.

$$-\left(-\frac{3}{10}\right)$$

-\frac{3}{10} ning teskarisi \frac{3}{10} ga teng.

$$\frac{3}{10}$$

Omil

$$\frac{3}{2 \cdot 5} = 0,3$$