30:(1-12+9)-(3*3-12:3)+21 eching

$$30 : ( 1 - 12 + 9 ) - ( 3 \cdot 3 - 12 : 3 ) + 21$$

Baholash

$$1$$

Yechim qadamlari

-11 olish uchun 1 dan 12 ni ayirish.

$$\frac{30}{-11+9}-\left(3\times 3-\frac{12}{3}\right)+21$$

-2 olish uchun -11 va 9'ni qo'shing.

$$\frac{30}{-2}-\left(3\times 3-\frac{12}{3}\right)+21$$

-15 ni olish uchun 30 ni -2 ga bo‘ling.

$$-15-\left(3\times 3-\frac{12}{3}\right)+21$$

9 hosil qilish uchun 3 va 3 ni ko'paytirish.

$$-15-\left(9-\frac{12}{3}\right)+21$$

4 ni olish uchun 12 ni 3 ga bo‘ling.

$$-15-\left(9-4\right)+21$$

5 olish uchun 9 dan 4 ni ayirish.

$$-15-5+21$$

-20 olish uchun -15 dan 5 ni ayirish.

$$-20+21$$

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

$$1$$

Omil

$$1$$