12/5+-4/25--12/20= eching

$$\frac { 12 } { 5 } + \frac { - 4 } { 25 } - \frac { - 12 } { 20 } =$$

Baholash

$$\frac{71}{25}=2,84$$

Yechim qadamlari

\frac{-4}{25} kasri manfiy belgini olib tashlash bilan -\frac{4}{25} sifatida qayta yozilishi mumkin.

$$\frac{12}{5}-\frac{4}{25}-\frac{-12}{20}$$

5 va 25 ning eng kichik umumiy karralisi 25 ga teng. \frac{12}{5} va \frac{4}{25} ni 25 maxraj bilan kasrlarga aylantirib oling.

$$\frac{60}{25}-\frac{4}{25}-\frac{-12}{20}$$

\frac{60}{25} va \frac{4}{25} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{60-4}{25}-\frac{-12}{20}$$

56 olish uchun 60 dan 4 ni ayirish.

$$\frac{56}{25}-\frac{-12}{20}$$

\frac{-12}{20} ulushini 4 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{56}{25}-\left(-\frac{3}{5}\right)$$

-\frac{3}{5} ning teskarisi \frac{3}{5} ga teng.

$$\frac{56}{25}+\frac{3}{5}$$

25 va 5 ning eng kichik umumiy karralisi 25 ga teng. \frac{56}{25} va \frac{3}{5} ni 25 maxraj bilan kasrlarga aylantirib oling.

$$\frac{56}{25}+\frac{15}{25}$$

\frac{56}{25} va \frac{15}{25} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{56+15}{25}$$

71 olish uchun 56 va 15'ni qo'shing.

$$\frac{71}{25}$$

Omil

$$\frac{71}{5 ^ {2}} = 2\frac{21}{25} = 2,84$$