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\frac{r\times \frac{4+1}{2}}{\frac{2}{5}}
4 hosil qilish uchun 2 va 2 ni ko'paytirish.
\frac{r\times \frac{5}{2}}{\frac{2}{5}}
5 olish uchun 4 va 1'ni qo'shing.
\frac{r\times \frac{5}{2}\times 5}{2}
r\times \frac{5}{2} ni \frac{2}{5} ga bo'lish r\times \frac{5}{2} ga k'paytirish \frac{2}{5} ga qaytarish.
\frac{r\times \frac{5\times 5}{2}}{2}
\frac{5}{2}\times 5 ni yagona kasrga aylantiring.
\frac{r\times \frac{25}{2}}{2}
25 hosil qilish uchun 5 va 5 ni ko'paytirish.
r\times \frac{25}{4}
r\times \frac{25}{4} ni olish uchun r\times \frac{25}{2} ni 2 ga bo‘ling.
\frac{r\times \frac{4+1}{2}}{\frac{2}{5}}
4 hosil qilish uchun 2 va 2 ni ko'paytirish.
\frac{r\times \frac{5}{2}}{\frac{2}{5}}
5 olish uchun 4 va 1'ni qo'shing.
\frac{r\times \frac{5}{2}\times 5}{2}
r\times \frac{5}{2} ni \frac{2}{5} ga bo'lish r\times \frac{5}{2} ga k'paytirish \frac{2}{5} ga qaytarish.
\frac{r\times \frac{5\times 5}{2}}{2}
\frac{5}{2}\times 5 ni yagona kasrga aylantiring.
\frac{r\times \frac{25}{2}}{2}
25 hosil qilish uchun 5 va 5 ni ko'paytirish.
r\times \frac{25}{4}
r\times \frac{25}{4} ni olish uchun r\times \frac{25}{2} ni 2 ga bo‘ling.