1/2-3/5+4/7 eching

$$\frac { 1 } { 2 } - \frac { 3 } { 5 } + \frac { 4 } { 7 }$$

Baholash

$$\frac{33}{70}\approx 0,471428571$$

Yechim qadamlari

2 va 5 ning eng kichik umumiy karralisi 10 ga teng. \frac{1}{2} va \frac{3}{5} ni 10 maxraj bilan kasrlarga aylantirib oling.

$$\frac{5}{10}-\frac{6}{10}+\frac{4}{7}$$

\frac{5}{10} va \frac{6}{10} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{5-6}{10}+\frac{4}{7}$$

-1 olish uchun 5 dan 6 ni ayirish.

$$-\frac{1}{10}+\frac{4}{7}$$

10 va 7 ning eng kichik umumiy karralisi 70 ga teng. -\frac{1}{10} va \frac{4}{7} ni 70 maxraj bilan kasrlarga aylantirib oling.

$$-\frac{7}{70}+\frac{40}{70}$$

-\frac{7}{70} va \frac{40}{70} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{-7+40}{70}$$

33 olish uchun -7 va 40'ni qo'shing.

$$\frac{33}{70}$$

Omil

$$\frac{3 \cdot 11}{2 \cdot 5 \cdot 7} = 0,4714285714285714$$