7*(k-2)+2*(lambda-2)+(k-2)*(-7+lambda)-klambda eching

$$7 \cdot ( k - 2 ) + 2 \cdot ( \lambda - 2 ) + ( k - 2 ) \cdot ( - 7 + \lambda ) - k \lambda$$

Baholash

$$-4$$

Yechim qadamlari

7 ga k-2 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$7k-14+2\left(\lambda -2\right)+\left(k-2\right)\left(-7+\lambda \right)-k\lambda$$

2 ga \lambda -2 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$7k-14+2\lambda -4+\left(k-2\right)\left(-7+\lambda \right)-k\lambda$$

-18 olish uchun -14 dan 4 ni ayirish.

$$7k-18+2\lambda +\left(k-2\right)\left(-7+\lambda \right)-k\lambda$$

k-2 ifodaning har bir elementini -7+\lambda ifodaning har bir elementiga ko‘paytirish orqali taqsimot qonuni xususiyatlarini qo‘llash mumkin.

$$7k-18+2\lambda -7k+k\lambda +14-2\lambda -k\lambda$$

0 ni olish uchun 7k va -7k ni birlashtirish.

$$-18+2\lambda +k\lambda +14-2\lambda -k\lambda$$

-4 olish uchun -18 va 14'ni qo'shing.

$$-4+2\lambda +k\lambda -2\lambda -k\lambda$$

0 ni olish uchun 2\lambda va -2\lambda ni birlashtirish.

$$-4+k\lambda -k\lambda$$

0 ni olish uchun k\lambda va -k\lambda ni birlashtirish.

$$-4$$

Omil

$$-4$$