15*65-15*45div2 eching

$$15 \times 65-15 \times 45 \div 2$$

Baholash

$$\frac{1275}{2}=637,5$$

Yechim qadamlari

975 hosil qilish uchun 15 va 65 ni ko'paytirish.

$$975-\frac{15\times 45}{2}$$

675 hosil qilish uchun 15 va 45 ni ko'paytirish.

$$975-\frac{675}{2}$$

975 ni \frac{1950}{2} kasrga o‘giring.

$$\frac{1950}{2}-\frac{675}{2}$$

\frac{1950}{2} va \frac{675}{2} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{1950-675}{2}$$

1275 olish uchun 1950 dan 675 ni ayirish.

$$\frac{1275}{2}$$

Omil

$$\frac{3 \cdot 5 ^ {2} \cdot 17}{2} = 637\frac{1}{2} = 637,5$$