(1.2-4/5)^-2+sqrt{25/16}-2^-1= eching

$$( 1.2 - \frac { 4 } { 5 } ) ^ { - 2 } + \sqrt { \frac { 25 } { 16 } } - 2 ^ { - 1 } =$$

Baholash

$$7$$

Yechim qadamlari

\frac{2}{5} olish uchun 1,2 dan \frac{4}{5} ni ayirish.

$$\left(\frac{2}{5}\right)^{-2}+\sqrt{\frac{25}{16}}-2^{-1}$$

-2 daraja ko‘rsatkichini \frac{2}{5} ga hisoblang va \frac{25}{4} ni qiymatni oling.

$$\frac{25}{4}+\sqrt{\frac{25}{16}}-2^{-1}$$

\frac{25}{16} boʻlinmasining kvadrat ildizini \frac{\sqrt{25}}{\sqrt{16}} kvadrat ildizlarining boʻlinmasi sifatida qayta yozing. Surat va maxrajni kvadrat ildizdan chiqaring.

$$\frac{25}{4}+\frac{5}{4}-2^{-1}$$

\frac{15}{2} olish uchun \frac{25}{4} va \frac{5}{4}'ni qo'shing.

$$\frac{15}{2}-2^{-1}$$

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

$$\frac{15}{2}-\frac{1}{2}$$

7 olish uchun \frac{15}{2} dan \frac{1}{2} ni ayirish.

$$7$$

Omil

$$7$$