-1/4*8/6-7/18*9/21 eching

$$- \frac{ 1 }{ 4 } \times \frac{ 8 }{ 6 } - \frac{ 7 }{ 18 } \times \frac{ 9 }{ 21 }$$

Baholash

$$-\frac{1}{2}=-0,5$$

Yechim qadamlari

\frac{8}{6} ulushini 2 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$-\frac{1}{4}\times \frac{4}{3}-\frac{7}{18}\times \frac{9}{21}$$

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali -\frac{1}{4} ni \frac{4}{3} ga ko‘paytiring.

$$\frac{-4}{4\times 3}-\frac{7}{18}\times \frac{9}{21}$$

Surat va maxrajdagi ikkala 4 ni qisqartiring.

$$\frac{-1}{3}-\frac{7}{18}\times \frac{9}{21}$$

\frac{-1}{3} kasri manfiy belgini olib tashlash bilan -\frac{1}{3} sifatida qayta yozilishi mumkin.

$$-\frac{1}{3}-\frac{7}{18}\times \frac{9}{21}$$

\frac{9}{21} ulushini 3 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$-\frac{1}{3}-\frac{7}{18}\times \frac{3}{7}$$

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali \frac{7}{18} ni \frac{3}{7} ga ko‘paytiring.

$$-\frac{1}{3}-\frac{7\times 3}{18\times 7}$$

Surat va maxrajdagi ikkala 7 ni qisqartiring.

$$-\frac{1}{3}-\frac{3}{18}$$

\frac{3}{18} ulushini 3 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$-\frac{1}{3}-\frac{1}{6}$$

3 va 6 ning eng kichik umumiy karralisi 6 ga teng. -\frac{1}{3} va \frac{1}{6} ni 6 maxraj bilan kasrlarga aylantirib oling.

$$-\frac{2}{6}-\frac{1}{6}$$

-\frac{2}{6} va \frac{1}{6} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{-2-1}{6}$$

-3 olish uchun -2 dan 1 ni ayirish.

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

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

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

Omil

$$-\frac{1}{2} = -0,5$$