(3/20+7/30)*15 eching

$$( \frac { 3 } { 20 } + \frac { 7 } { 30 } ) \cdot 15$$

Baholash

$$\frac{23}{4}=5,75$$

Yechim qadamlari

20 va 30 ning eng kichik umumiy karralisi 60 ga teng. \frac{3}{20} va \frac{7}{30} ni 60 maxraj bilan kasrlarga aylantirib oling.

$$\left(\frac{9}{60}+\frac{14}{60}\right)\times 15$$

\frac{9}{60} va \frac{14}{60} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{9+14}{60}\times 15$$

23 olish uchun 9 va 14'ni qo'shing.

$$\frac{23}{60}\times 15$$

\frac{23}{60}\times 15 ni yagona kasrga aylantiring.

$$\frac{23\times 15}{60}$$

345 hosil qilish uchun 23 va 15 ni ko'paytirish.

$$\frac{345}{60}$$

\frac{345}{60} ulushini 15 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{23}{4}$$

Omil

$$\frac{23}{2 ^ {2}} = 5\frac{3}{4} = 5,75$$