3/4+1/2-1/5 eching

$$\frac{ 3 }{ 4 } + \frac{ 1 }{ 2 } - \frac{ 1 }{ 5 }$$

Baholash

$$\frac{21}{20}=1,05$$

Yechim qadamlari

4 va 2 ning eng kichik umumiy karralisi 4 ga teng. \frac{3}{4} va \frac{1}{2} ni 4 maxraj bilan kasrlarga aylantirib oling.

$$\frac{3}{4}+\frac{2}{4}-\frac{1}{5}$$

\frac{3}{4} va \frac{2}{4} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{3+2}{4}-\frac{1}{5}$$

5 olish uchun 3 va 2'ni qo'shing.

$$\frac{5}{4}-\frac{1}{5}$$

4 va 5 ning eng kichik umumiy karralisi 20 ga teng. \frac{5}{4} va \frac{1}{5} ni 20 maxraj bilan kasrlarga aylantirib oling.

$$\frac{25}{20}-\frac{4}{20}$$

\frac{25}{20} va \frac{4}{20} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{25-4}{20}$$

21 olish uchun 25 dan 4 ni ayirish.

$$\frac{21}{20}$$

Omil

$$\frac{3 \cdot 7}{2 ^ {2} \cdot 5} = 1\frac{1}{20} = 1,05$$