9/10-(2/5+1/4)= eching

$$\frac { 9 } { 10 } - ( \frac { 2 } { 5 } + \frac { 1 } { 4 } ) =$$

Baholash

$$\frac{1}{4}=0,25$$

Yechim qadamlari

5 va 4 ning eng kichik umumiy karralisi 20 ga teng. \frac{2}{5} va \frac{1}{4} ni 20 maxraj bilan kasrlarga aylantirib oling.

$$\frac{9}{10}-\left(\frac{8}{20}+\frac{5}{20}\right)$$

\frac{8}{20} va \frac{5}{20} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{9}{10}-\frac{8+5}{20}$$

13 olish uchun 8 va 5'ni qo'shing.

$$\frac{9}{10}-\frac{13}{20}$$

10 va 20 ning eng kichik umumiy karralisi 20 ga teng. \frac{9}{10} va \frac{13}{20} ni 20 maxraj bilan kasrlarga aylantirib oling.

$$\frac{18}{20}-\frac{13}{20}$$

\frac{18}{20} va \frac{13}{20} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{18-13}{20}$$

5 olish uchun 18 dan 13 ni ayirish.

$$\frac{5}{20}$$

\frac{5}{20} ulushini 5 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{1}{4}$$

Omil

$$\frac{1}{2 ^ {2}} = 0,25$$