3+1/2-2/5 eching

$$3 + \frac { 1 } { 2 } - \frac { 2 } { 5 }$$

Baholash

$$\frac{31}{10}=3,1$$

Yechim qadamlari

3 ni \frac{6}{2} kasrga o‘giring.

$$\frac{6}{2}+\frac{1}{2}-\frac{2}{5}$$

\frac{6}{2} va \frac{1}{2} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{6+1}{2}-\frac{2}{5}$$

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

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

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

$$\frac{35}{10}-\frac{4}{10}$$

\frac{35}{10} va \frac{4}{10} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{35-4}{10}$$

31 olish uchun 35 dan 4 ni ayirish.

$$\frac{31}{10}$$

Omil

$$\frac{31}{2 \cdot 5} = 3\frac{1}{10} = 3,1$$