(-9/2)^2+9(-9/2)+18 eching

$$( - \frac { 9 } { 2 } ) ^ { 2 } + 9 ( - \frac { 9 } { 2 } ) + 18$$

Baholash

$$-\frac{9}{4}=-2,25$$

Yechim qadamlari

2 daraja ko‘rsatkichini -\frac{9}{2} ga hisoblang va \frac{81}{4} ni qiymatni oling.

$$\frac{81}{4}+9\left(-\frac{9}{2}\right)+18$$

9\left(-\frac{9}{2}\right) ni yagona kasrga aylantiring.

$$\frac{81}{4}+\frac{9\left(-9\right)}{2}+18$$

-81 hosil qilish uchun 9 va -9 ni ko'paytirish.

$$\frac{81}{4}+\frac{-81}{2}+18$$

\frac{-81}{2} kasri manfiy belgini olib tashlash bilan -\frac{81}{2} sifatida qayta yozilishi mumkin.

$$\frac{81}{4}-\frac{81}{2}+18$$

4 va 2 ning eng kichik umumiy karralisi 4 ga teng. \frac{81}{4} va \frac{81}{2} ni 4 maxraj bilan kasrlarga aylantirib oling.

$$\frac{81}{4}-\frac{162}{4}+18$$

\frac{81}{4} va \frac{162}{4} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{81-162}{4}+18$$

-81 olish uchun 81 dan 162 ni ayirish.

$$-\frac{81}{4}+18$$

18 ni \frac{72}{4} kasrga o‘giring.

$$-\frac{81}{4}+\frac{72}{4}$$

-\frac{81}{4} va \frac{72}{4} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{-81+72}{4}$$

-9 olish uchun -81 va 72'ni qo'shing.

$$-\frac{9}{4}$$

Omil

$$-\frac{9}{4} = -2\frac{1}{4} = -2,25$$