51/4-22/5= eching

$$5 \frac { 1 } { 4 } - 2 \frac { 2 } { 5 } =$$

Baholash

$$\frac{57}{20}=2,85$$

Yechim qadamlari

20 hosil qilish uchun 5 va 4 ni ko'paytirish.

$$\frac{20+1}{4}-\frac{2\times 5+2}{5}$$

21 olish uchun 20 va 1'ni qo'shing.

$$\frac{21}{4}-\frac{2\times 5+2}{5}$$

10 hosil qilish uchun 2 va 5 ni ko'paytirish.

$$\frac{21}{4}-\frac{10+2}{5}$$

12 olish uchun 10 va 2'ni qo'shing.

$$\frac{21}{4}-\frac{12}{5}$$

4 va 5 ning eng kichik umumiy karralisi 20 ga teng. \frac{21}{4} va \frac{12}{5} ni 20 maxraj bilan kasrlarga aylantirib oling.

$$\frac{105}{20}-\frac{48}{20}$$

\frac{105}{20} va \frac{48}{20} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{105-48}{20}$$

57 olish uchun 105 dan 48 ni ayirish.

$$\frac{57}{20}$$

Omil

$$\frac{3 \cdot 19}{2 ^ {2} \cdot 5} = 2\frac{17}{20} = 2,85$$