4-9/39*21/6 eching

$$4- \frac{ 9 }{ 39 } \times 2 \frac { 1 } { 6 }$$

Baholash

$$\frac{7}{2}=3,5$$

Yechim qadamlari

\frac{9}{39} ulushini 3 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$4-\frac{3}{13}\times \frac{2\times 6+1}{6}$$

12 hosil qilish uchun 2 va 6 ni ko'paytirish.

$$4-\frac{3}{13}\times \frac{12+1}{6}$$

13 olish uchun 12 va 1'ni qo'shing.

$$4-\frac{3}{13}\times \frac{13}{6}$$

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali \frac{3}{13} ni \frac{13}{6} ga ko‘paytiring.

$$4-\frac{3\times 13}{13\times 6}$$

Surat va maxrajdagi ikkala 13 ni qisqartiring.

$$4-\frac{3}{6}$$

\frac{3}{6} ulushini 3 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$4-\frac{1}{2}$$

4 ni \frac{8}{2} kasrga o‘giring.

$$\frac{8}{2}-\frac{1}{2}$$

\frac{8}{2} va \frac{1}{2} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{8-1}{2}$$

7 olish uchun 8 dan 1 ni ayirish.

$$\frac{7}{2}$$

Omil

$$\frac{7}{2} = 3\frac{1}{2} = 3,5$$