-64div31/5*5/8 eching

$$- 64 \div 3 \frac { 1 } { 5 } \times \frac { 5 } { 8 }$$

Baholash

$$-\frac{25}{2}=-12,5$$

Yechim qadamlari

-64 ni \frac{3\times 5+1}{5} ga bo'lish -64 ga k'paytirish \frac{3\times 5+1}{5} ga qaytarish.

$$\frac{-64\times 5}{3\times 5+1}\times \frac{5}{8}$$

-320 hosil qilish uchun -64 va 5 ni ko'paytirish.

$$\frac{-320}{3\times 5+1}\times \frac{5}{8}$$

15 hosil qilish uchun 3 va 5 ni ko'paytirish.

$$\frac{-320}{15+1}\times \frac{5}{8}$$

16 olish uchun 15 va 1'ni qo'shing.

$$\frac{-320}{16}\times \frac{5}{8}$$

-20 ni olish uchun -320 ni 16 ga bo‘ling.

$$-20\times \frac{5}{8}$$

-20\times \frac{5}{8} ni yagona kasrga aylantiring.

$$\frac{-20\times 5}{8}$$

-100 hosil qilish uchun -20 va 5 ni ko'paytirish.

$$\frac{-100}{8}$$

\frac{-100}{8} ulushini 4 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$-\frac{25}{2}$$

Omil

$$-\frac{25}{2} = -12\frac{1}{2} = -12,5$$