-frac{sqrt{(20^2)+2(981)(40)-2(981)(0)+20}}{981} eching

$$- \frac{ \sqrt{ ( { 20 }^{ 2 } )+2(981)(40)-2(981)(0)+20 } }{ 981 }$$

Baholash

$$-\frac{10\sqrt{789}}{981}\approx -0,286331741$$

Yechim qadamlari

2 daraja ko‘rsatkichini 20 ga hisoblang va 400 ni qiymatni oling.

$$-\frac{\sqrt{400+2\times 981\times 40-2\times 981\times 0+20}}{981}$$

1962 hosil qilish uchun 2 va 981 ni ko'paytirish.

$$-\frac{\sqrt{400+1962\times 40-2\times 981\times 0+20}}{981}$$

78480 hosil qilish uchun 1962 va 40 ni ko'paytirish.

$$-\frac{\sqrt{400+78480-2\times 981\times 0+20}}{981}$$

78880 olish uchun 400 va 78480'ni qo'shing.

$$-\frac{\sqrt{78880-2\times 981\times 0+20}}{981}$$

1962 hosil qilish uchun 2 va 981 ni ko'paytirish.

$$-\frac{\sqrt{78880-1962\times 0+20}}{981}$$

0 hosil qilish uchun 1962 va 0 ni ko'paytirish.

$$-\frac{\sqrt{78880-0+20}}{981}$$

78880 olish uchun 78880 dan 0 ni ayirish.

$$-\frac{\sqrt{78880+20}}{981}$$

78900 olish uchun 78880 va 20'ni qo'shing.

$$-\frac{\sqrt{78900}}{981}$$

Faktor: 78900=10^{2}\times 789. \sqrt{10^{2}\times 789} koʻpaytmasining kvadrat ildizini \sqrt{10^{2}}\sqrt{789} kvadrat ildizlarining koʻpaytmasi sifatida qayta yozing. 10^{2} ning kvadrat ildizini chiqarish.

$$-\frac{10\sqrt{789}}{981}$$