(-7)^2*(-7)^5*(-7)^-9? eching

$$( - 7 ) ^ { 2 } \cdot ( - 7 ) ^ { 5 } \cdot ( - 7 ) ^ { - 9 } ?$$

Baholash

$$\frac{1}{49}\approx 0,020408163$$

Yechim qadamlari

Ayni asosning daraja ko‘rsatkichlarini ko‘paytirish uchun ularning darajalarini qo‘shing. 2 va 5 ni qo‘shib, 7 ni oling.

$$\left(-7\right)^{7}\left(-7\right)^{-9}$$

Ayni asosning daraja ko‘rsatkichlarini ko‘paytirish uchun ularning darajalarini qo‘shing. 7 va -9 ni qo‘shib, -2 ni oling.

$$\left(-7\right)^{-2}$$

-2 daraja ko‘rsatkichini -7 ga hisoblang va \frac{1}{49} ni qiymatni oling.

$$\frac{1}{49}$$

Omil

$$\frac{1}{7 ^ {2}} = 0,02040816326530612$$