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\frac{28\left(\sqrt{11}-2\right)}{\left(\sqrt{11}+2\right)\left(\sqrt{11}-2\right)}
\frac{28}{\sqrt{11}+2} maxrajini \sqrt{11}-2 orqali surat va maxrajini koʻpaytirish orqali ratsionallashtiring.
\frac{28\left(\sqrt{11}-2\right)}{\left(\sqrt{11}\right)^{2}-2^{2}}
Hisoblang: \left(\sqrt{11}+2\right)\left(\sqrt{11}-2\right). Ko‘paytirish qoida yordamida turli kvadratlarga aylantirilishi mumkin: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{28\left(\sqrt{11}-2\right)}{11-4}
\sqrt{11} kvadratini chiqarish. 2 kvadratini chiqarish.
\frac{28\left(\sqrt{11}-2\right)}{7}
7 olish uchun 11 dan 4 ni ayirish.
4\left(\sqrt{11}-2\right)
4\left(\sqrt{11}-2\right) ni olish uchun 28\left(\sqrt{11}-2\right) ni 7 ga bo‘ling.
4\sqrt{11}-8
4 ga \sqrt{11}-2 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.