21/2+4(1/2+1/2)+7 eching

$$2 \frac{ 1 }{ 2 } +4( \frac{ 1 }{ 2 } + \frac{ 1 }{ 2 } )+7$$

Baholash

$$\frac{27}{2}=13,5$$

Yechim qadamlari

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

$$\frac{4+1}{2}+4\left(\frac{1}{2}+\frac{1}{2}\right)+7$$

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

$$\frac{5}{2}+4\left(\frac{1}{2}+\frac{1}{2}\right)+7$$

\frac{1}{2} va \frac{1}{2} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{5}{2}+4\times \frac{1+1}{2}+7$$

2 olish uchun 1 va 1'ni qo'shing.

$$\frac{5}{2}+4\times \frac{2}{2}+7$$

1 ni olish uchun 2 ni 2 ga bo‘ling.

$$\frac{5}{2}+4\times 1+7$$

4 hosil qilish uchun 4 va 1 ni ko'paytirish.

$$\frac{5}{2}+4+7$$

4 ni \frac{8}{2} kasrga o‘giring.

$$\frac{5}{2}+\frac{8}{2}+7$$

\frac{5}{2} va \frac{8}{2} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{5+8}{2}+7$$

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

$$\frac{13}{2}+7$$

7 ni \frac{14}{2} kasrga o‘giring.

$$\frac{13}{2}+\frac{14}{2}$$

\frac{13}{2} va \frac{14}{2} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{13+14}{2}$$

27 olish uchun 13 va 14'ni qo'shing.

$$\frac{27}{2}$$

Omil

$$\frac{3 ^ {3}}{2} = 13\frac{1}{2} = 13,5$$