-7/10-3(2/5) eching

$$- \frac{ 7 }{ 10 } -3( \frac{ 2 }{ 5 } )$$

Baholash

$$-\frac{19}{10}=-1,9$$

Yechim qadamlari

3\times \frac{2}{5} ni yagona kasrga aylantiring.

$$-\frac{7}{10}-\frac{3\times 2}{5}$$

6 hosil qilish uchun 3 va 2 ni ko'paytirish.

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

10 va 5 ning eng kichik umumiy karralisi 10 ga teng. -\frac{7}{10} va \frac{6}{5} ni 10 maxraj bilan kasrlarga aylantirib oling.

$$-\frac{7}{10}-\frac{12}{10}$$

-\frac{7}{10} va \frac{12}{10} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{-7-12}{10}$$

-19 olish uchun -7 dan 12 ni ayirish.

$$-\frac{19}{10}$$

Omil

$$-\frac{19}{10} = -1\frac{9}{10} = -1,9$$