9/2-20/1+15/1 eching

$$\frac{ 9 }{ 2 } - \frac{ 20 }{ 1 } + \frac{ 15 }{ 1 }$$

Baholash

$$-\frac{1}{2}=-0,5$$

Yechim qadamlari

Har qanday son birga bo‘linganda, natija o‘zi chiqadi.

$$\frac{9}{2}-20+\frac{15}{1}$$

20 ni \frac{40}{2} kasrga o‘giring.

$$\frac{9}{2}-\frac{40}{2}+\frac{15}{1}$$

\frac{9}{2} va \frac{40}{2} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{9-40}{2}+\frac{15}{1}$$

-31 olish uchun 9 dan 40 ni ayirish.

$$-\frac{31}{2}+\frac{15}{1}$$

Har qanday son birga bo‘linganda, natija o‘zi chiqadi.

$$-\frac{31}{2}+15$$

15 ni \frac{30}{2} kasrga o‘giring.

$$-\frac{31}{2}+\frac{30}{2}$$

-\frac{31}{2} va \frac{30}{2} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{-31+30}{2}$$

-1 olish uchun -31 va 30'ni qo'shing.

$$-\frac{1}{2}$$

Omil

$$-\frac{1}{2} = -0,5$$