5/8+3/20+-1/15 eching

$$\frac { 5 } { 8 } + \frac { 3 } { 20 } + \frac { - 1 } { 15 }$$

Baholash

$$\frac{17}{24}\approx 0,708333333$$

Yechim qadamlari

8 va 20 ning eng kichik umumiy karralisi 40 ga teng. \frac{5}{8} va \frac{3}{20} ni 40 maxraj bilan kasrlarga aylantirib oling.

$$\frac{25}{40}+\frac{6}{40}+\frac{-1}{15}$$

\frac{25}{40} va \frac{6}{40} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{25+6}{40}+\frac{-1}{15}$$

31 olish uchun 25 va 6'ni qo'shing.

$$\frac{31}{40}+\frac{-1}{15}$$

\frac{-1}{15} kasri manfiy belgini olib tashlash bilan -\frac{1}{15} sifatida qayta yozilishi mumkin.

$$\frac{31}{40}-\frac{1}{15}$$

40 va 15 ning eng kichik umumiy karralisi 120 ga teng. \frac{31}{40} va \frac{1}{15} ni 120 maxraj bilan kasrlarga aylantirib oling.

$$\frac{93}{120}-\frac{8}{120}$$

\frac{93}{120} va \frac{8}{120} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{93-8}{120}$$

85 olish uchun 93 dan 8 ni ayirish.

$$\frac{85}{120}$$

\frac{85}{120} ulushini 5 ni chiqarib, bekor qilish hisobiga eng past shartlarga kamaytiring.

$$\frac{17}{24}$$

Omil

$$\frac{17}{2 ^ {3} \cdot 3} = 0,7083333333333334$$