(1/8+2/5)*(5/2div1/4) eching

$$( \frac{ 1 }{ 8 } + \frac{ 2 }{ 5 } ) \times ( \frac{ 5 }{ 2 } \div \frac{ 1 }{ 4 } )$$

Baholash

$$\frac{21}{4}=5,25$$

Yechim qadamlari

8 va 5 ning eng kichik umumiy karralisi 40 ga teng. \frac{1}{8} va \frac{2}{5} ni 40 maxraj bilan kasrlarga aylantirib oling.

$$\left(\frac{5}{40}+\frac{16}{40}\right)\times \frac{\frac{5}{2}}{\frac{1}{4}}$$

\frac{5}{40} va \frac{16}{40} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{5+16}{40}\times \frac{\frac{5}{2}}{\frac{1}{4}}$$

21 olish uchun 5 va 16'ni qo'shing.

$$\frac{21}{40}\times \frac{\frac{5}{2}}{\frac{1}{4}}$$

\frac{5}{2} ni \frac{1}{4} ga bo'lish \frac{5}{2} ga k'paytirish \frac{1}{4} ga qaytarish.

$$\frac{21}{40}\times \frac{5}{2}\times 4$$

\frac{5}{2}\times 4 ni yagona kasrga aylantiring.

$$\frac{21}{40}\times \frac{5\times 4}{2}$$

20 hosil qilish uchun 5 va 4 ni ko'paytirish.

$$\frac{21}{40}\times \frac{20}{2}$$

10 ni olish uchun 20 ni 2 ga bo‘ling.

$$\frac{21}{40}\times 10$$

\frac{21}{40}\times 10 ni yagona kasrga aylantiring.

$$\frac{21\times 10}{40}$$

210 hosil qilish uchun 21 va 10 ni ko'paytirish.

$$\frac{210}{40}$$

\frac{210}{40} ulushini 10 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{21}{4}$$

Omil

$$\frac{3 \cdot 7}{2 ^ {2}} = 5\frac{1}{4} = 5,25$$