42/5+31/4 eching

$$4 \frac{ 2 }{ 5 } +3 \frac{ 1 }{ 4 }$$

Baholash

$$\frac{153}{20}=7,65$$

Yechim qadamlari

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

$$\frac{20+2}{5}+\frac{3\times 4+1}{4}$$

22 olish uchun 20 va 2'ni qo'shing.

$$\frac{22}{5}+\frac{3\times 4+1}{4}$$

12 hosil qilish uchun 3 va 4 ni ko'paytirish.

$$\frac{22}{5}+\frac{12+1}{4}$$

13 olish uchun 12 va 1'ni qo'shing.

$$\frac{22}{5}+\frac{13}{4}$$

5 va 4 ning eng kichik umumiy karralisi 20 ga teng. \frac{22}{5} va \frac{13}{4} ni 20 maxraj bilan kasrlarga aylantirib oling.

$$\frac{88}{20}+\frac{65}{20}$$

\frac{88}{20} va \frac{65}{20} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{88+65}{20}$$

153 olish uchun 88 va 65'ni qo'shing.

$$\frac{153}{20}$$

Omil

$$\frac{3 ^ {2} \cdot 17}{2 ^ {2} \cdot 5} = 7\frac{13}{20} = 7,65$$