21/2*81/2-12 eching

$$21 / 2 \times 81 / 2 - 12$$

Baholash

$$\frac{1653}{4}=413,25$$

Yechim qadamlari

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali \frac{21}{2} ni \frac{81}{2} ga ko‘paytiring.

$$\frac{21\times 81}{2\times 2}-12$$

\frac{21\times 81}{2\times 2} kasridagi ko‘paytirishlarni bajaring.

$$\frac{1701}{4}-12$$

12 ni \frac{48}{4} kasrga o‘giring.

$$\frac{1701}{4}-\frac{48}{4}$$

\frac{1701}{4} va \frac{48}{4} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{1701-48}{4}$$

1653 olish uchun 1701 dan 48 ni ayirish.

$$\frac{1653}{4}$$

Omil

$$\frac{3 \cdot 19 \cdot 29}{2 ^ {2}} = 413\frac{1}{4} = 413,25$$