(21*10^-2)-(28*10^-5) eching

$$( 21 \times 10 ^ { - 2 } ) - ( 28 \times 10 ^ { - 5 } )$$

Baholash

$$\frac{5243}{25000}=0,20972$$

Yechim qadamlari

-2 daraja ko‘rsatkichini 10 ga hisoblang va \frac{1}{100} ni qiymatni oling.

$$21\times \frac{1}{100}-28\times 10^{-5}$$

\frac{21}{100} hosil qilish uchun 21 va \frac{1}{100} ni ko'paytirish.

$$\frac{21}{100}-28\times 10^{-5}$$

-5 daraja ko‘rsatkichini 10 ga hisoblang va \frac{1}{100000} ni qiymatni oling.

$$\frac{21}{100}-28\times \frac{1}{100000}$$

\frac{7}{25000} hosil qilish uchun 28 va \frac{1}{100000} ni ko'paytirish.

$$\frac{21}{100}-\frac{7}{25000}$$

\frac{5243}{25000} olish uchun \frac{21}{100} dan \frac{7}{25000} ni ayirish.

$$\frac{5243}{25000}$$

Omil

$$\frac{7 ^ {2} \cdot 107}{2 ^ {3} \cdot 5 ^ {5}} = 0,20972$$