71/5-21/2= eching

$$7 \frac { 1 } { 5 } - 2 \frac { 1 } { 2 } =$$

Baholash

$$\frac{47}{10}=4,7$$

Yechim qadamlari

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

$$\frac{35+1}{5}-\frac{2\times 2+1}{2}$$

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

$$\frac{36}{5}-\frac{2\times 2+1}{2}$$

4 hosil qilish uchun 2 va 2 ni ko'paytirish.

$$\frac{36}{5}-\frac{4+1}{2}$$

5 olish uchun 4 va 1'ni qo'shing.

$$\frac{36}{5}-\frac{5}{2}$$

5 va 2 ning eng kichik umumiy karralisi 10 ga teng. \frac{36}{5} va \frac{5}{2} ni 10 maxraj bilan kasrlarga aylantirib oling.

$$\frac{72}{10}-\frac{25}{10}$$

\frac{72}{10} va \frac{25}{10} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{72-25}{10}$$

47 olish uchun 72 dan 25 ni ayirish.

$$\frac{47}{10}$$

Omil

$$\frac{47}{2 \cdot 5} = 4\frac{7}{10} = 4,7$$