3/5+(-7/8)-13/20 eching

$$\frac { 3 } { 5 } + ( - \frac { 7 } { 8 } ) - \frac { 13 } { 20 }$$

Baholash

$$-\frac{37}{40}=-0,925$$

Yechim qadamlari

5 va 8 ning eng kichik umumiy karralisi 40 ga teng. \frac{3}{5} va \frac{7}{8} ni 40 maxraj bilan kasrlarga aylantirib oling.

$$\frac{24}{40}-\frac{35}{40}-\frac{13}{20}$$

\frac{24}{40} va \frac{35}{40} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{24-35}{40}-\frac{13}{20}$$

-11 olish uchun 24 dan 35 ni ayirish.

$$-\frac{11}{40}-\frac{13}{20}$$

40 va 20 ning eng kichik umumiy karralisi 40 ga teng. -\frac{11}{40} va \frac{13}{20} ni 40 maxraj bilan kasrlarga aylantirib oling.

$$-\frac{11}{40}-\frac{26}{40}$$

-\frac{11}{40} va \frac{26}{40} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{-11-26}{40}$$

-37 olish uchun -11 dan 26 ni ayirish.

$$-\frac{37}{40}$$

Omil

$$-\frac{37}{40} = -0,925$$