4/12-9/7 eching

$$\frac{ 4 }{ 12 } - \frac{ 9 }{ 7 }$$

Baholash

$$-\frac{20}{21}\approx -0,952380952$$

Yechim qadamlari

\frac{4}{12} ulushini 4 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{1}{3}-\frac{9}{7}$$

3 va 7 ning eng kichik umumiy karralisi 21 ga teng. \frac{1}{3} va \frac{9}{7} ni 21 maxraj bilan kasrlarga aylantirib oling.

$$\frac{7}{21}-\frac{27}{21}$$

\frac{7}{21} va \frac{27}{21} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{7-27}{21}$$

-20 olish uchun 7 dan 27 ni ayirish.

$$-\frac{20}{21}$$

Omil

$$-\frac{20}{21} = -0,9523809523809523$$