15/7*21/2= eching

$$1 \frac { 5 } { 7 } \times 2 \frac { 1 } { 2 } =$$

Baholash

$$\frac{30}{7}\approx 4,285714286$$

Yechim qadamlari

7 hosil qilish uchun 1 va 7 ni ko'paytirish.

$$\frac{7+5}{7}\times \frac{2\times 2+1}{2}$$

12 olish uchun 7 va 5'ni qo'shing.

$$\frac{12}{7}\times \frac{2\times 2+1}{2}$$

4 hosil qilish uchun 2 va 2 ni ko'paytirish.

$$\frac{12}{7}\times \frac{4+1}{2}$$

5 olish uchun 4 va 1'ni qo'shing.

$$\frac{12}{7}\times \frac{5}{2}$$

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali \frac{12}{7} ni \frac{5}{2} ga ko‘paytiring.

$$\frac{12\times 5}{7\times 2}$$

\frac{12\times 5}{7\times 2} kasridagi ko‘paytirishlarni bajaring.

$$\frac{60}{14}$$

\frac{60}{14} ulushini 2 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{30}{7}$$

Omil

$$\frac{2 \cdot 3 \cdot 5}{7} = 4\frac{2}{7} = 4,285714285714286$$