Baholash
\frac{63-7\sqrt{13}}{68}\approx 0,555310898
Baham ko'rish
Klipbordga nusxa olish
\frac{7\left(9-\sqrt{13}\right)}{\left(9+\sqrt{13}\right)\left(9-\sqrt{13}\right)}
\frac{7}{9+\sqrt{13}} maxrajini 9-\sqrt{13} orqali surat va maxrajini koʻpaytirish orqali ratsionallashtiring.
\frac{7\left(9-\sqrt{13}\right)}{9^{2}-\left(\sqrt{13}\right)^{2}}
Hisoblang: \left(9+\sqrt{13}\right)\left(9-\sqrt{13}\right). Ko‘paytirish qoida yordamida turli kvadratlarga aylantirilishi mumkin: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{7\left(9-\sqrt{13}\right)}{81-13}
9 kvadratini chiqarish. \sqrt{13} kvadratini chiqarish.
\frac{7\left(9-\sqrt{13}\right)}{68}
68 olish uchun 81 dan 13 ni ayirish.
\frac{63-7\sqrt{13}}{68}
7 ga 9-\sqrt{13} ni ko'paytirish orqali distributiv xususiyatdan foydalanish.
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